CN101066528A - Composite oxide catalyst and method for preparation thereof - Google Patents

Composite oxide catalyst and method for preparation thereof Download PDF

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Publication number
CN101066528A
CN101066528A CNA2007101063915A CN200710106391A CN101066528A CN 101066528 A CN101066528 A CN 101066528A CN A2007101063915 A CNA2007101063915 A CN A2007101063915A CN 200710106391 A CN200710106391 A CN 200710106391A CN 101066528 A CN101066528 A CN 101066528A
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composite oxide
preparation
oxide catalysts
compound
bismuth
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CN101066528B (en
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勅使河原力
嘉糠成康
岩仓具敦
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Mitsubishi Chemical Corp
Mitsubishi Rayon Co Ltd
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Mitsubishi Kasei Corp
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Priority claimed from JP2001371232A external-priority patent/JP4060581B2/en
Priority claimed from JP2001372383A external-priority patent/JP2003170053A/en
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Abstract

The invention relates to a composite oxide catalyst for the oxidation of an olefin containing Mo and Bi as essential components, characterized in that it has a specific surface area of 5 to 25 m<2>/g and a pore volume of 0.2 to 0.7 cc/g, and has a pore diameter distribution wherein the volume of the pores having a pore diameter of 0.03 to 0.1 mum accounts for 30% or more of the total pore volume, the volume of the pores having a pore diameter of 0.1 to 1 mum accounts for 20% or more of the total pore volume, and the volume of the pores having a pore diameter of less than 0.03 mum is 10% or less of the total pore volume; a composite oxide catalyst for use in the vapor phase catalytic oxidation of acrolein or methacrolein or the like which comprises Mo, Bi and a halogen; either of the above two composite oxide catalysts which comprises Mo, Bi, Fe, Si and an element selected from alkali metals and thallium, and optionally Co, Ni, Mg, Ca, Zn, Ce, Sm, a halogen, P, As and W; a method for preparing any of the above composite catalysts; and a method for using any of the above composite oxide catalysts.

Description

Composite oxide catalysts and preparation method thereof
The application is a Chinese patent application (denomination of invention: composite oxide catalysts and preparation method thereof, the applying date: on November 8th, 2002; Dividing an application application number 02822228.8).
Technical field
The present invention relates to composite oxide catalysts and preparation method thereof, this catalyst is used for following reaction, that is, by propylene, isobutene or the tert-butyl alcohol prepare methacrylaldehyde or MAL gas phase catalytic oxidation reaction, by propylene or isobutene prepare acrylonitrile or methacrylonitrile the gas phase catalysis ammoxidation reaction, and prepare by butylene in the selective reaction of catalytic gas phase oxidation dehydrogenation reaction etc. of butadiene.
Background technology
The known gas phase catalysis ammoxidation reaction for preparing acrylonitrile or methacrylonitrile at the gas phase catalytic oxidation reaction for preparing methacrylaldehyde or MAL by propylene, isobutene or the tert-butyl alcohol, by propylene or isobutene, and prepare by butylene in the selective reaction of catalytic gas phase oxidation dehydrogenation reaction etc. of butadiene, the composite oxide catalysts of Mo-Bi system is known to be useful catalysts, industrial also by extensive practicability.
As the composition of the Mo-Bi system complex oxide that relates to above-mentioned various reactions and preparation method's patent documentation, known have a special public clear 39-3670 communique, special public clear 48-1645 communique, special public clear 48-4763 communique, special public clear 48-17253 communique, special public clear 49-3498 communique, special public clear 55-41213 communique, special public clear 56-14659 communique, special public clear 56-23969 communique, special public clear 56-52013 communique, special public clear 57-26245 communique, the spy opens clear 48-503 communique, the spy opens clear 48-514 communique, the spy opens clear 48-52713 communique, the spy opens clear 48-54027 communique, the spy opens clear 48-57916 communique, the spy opens clear 55-20610 communique, the spy opens clear 55-47144 communique, the spy opens clear 55-84541 communique, the spy opens clear 59-76541 communique, the spy opens many communiques such as clear 60-122041 communique.
Wherein, open clear 59-76541 communique and disclose in preparation during composite oxide catalysts except open clear 55-47144 communique and spy the spy, prepare in advance outside Mo-Bi or the W-Bi, other all be to use bismuth nitrate in an embodiment as the Bi raw material, in each explanation, as the Bi raw material, recommend water miscible bismuth compound, i.e. bismuth nitrate or hydroxide.The catalyst of being put down in writing is in these thought that Bi in composite oxide catalysts needs only even dispersion and just thinks rational prescription, but can not be obtained sufficient catalyst performance.
In addition, the catalyst of being put down in writing all contains silicon as catalyst constituent or carrier in these.Supply source compound as this silicon generally uses Ludox and silica gel.
As the method for before interpolation, modifying the silicon raw material, open the spy and to disclose in the flat 11-179206 communique that to use pH be Ludox below 5, be the method for prepare silicon colloidal sol under the acidic region at the slurries after the interpolation.
In addition, open clear 48-503 communique the public clear 49-3498 communique of spy, spy, the spy opens in clear 48-514 communique etc., disclose the catalyst of pyrogenic silica as the silicon raw material.This pyrogenic silica is by making the volatile compound that contains silicon react the finely particulate dry oxidation silicon of making in gas phase, with the different character of making by silica gel, white carbon, waterglass hydrolysis that has.
In these prior aries, add Ludox, silica gel or pyrogenic silica with more effective catalyst activity composition that utilizes as one of purpose, can reach corresponding achievement.
, having used the catalyst of above-mentioned Ludox, silica gel or pyrogenic silica etc., from reaching high yield aspect, is inadequate at present, wishes further to improve catalyst performance.
In addition, the composite oxide catalysts of the basic bismuth carbonate of Na as the use of Bi raw material disclosed solid solution in the fair 5-87300 communique of spy, the any a kind basic bismuth carbonate that discloses with solid solution Mg, Ca, Zn, Ce, Sm in the fair 6-13096 communique of spy is as the composite oxide catalysts that the Bi raw material uses, and also discloses with solid solution the composite oxide catalysts that the basic bismuth carbonate of any a kind and the Na of Mg, Ca, Zn, Ce, Sm uses as the Bi raw material in the fair 6-13097 communique of spy.
As mentioned above, for the catalytic gas phase oxidation reaction by propylene to prepare methacrylaldehyde (and then also have as active ingredient acrylic acid) with high yield, various catalyst were once proposed.They mainly relate to constitute, and the composition of catalyst and ratio thereof select, but wherein, also has the preparation method's of the selection of the rerum natura that relates to catalyst and its repeatability.
Particularly in the latter, even relate to the oxidation that is used for alkene and the composite oxide catalysts that contains molybdenum (Mo), bismuth (Bi) and iron (Fe) of ammoxidation reaction, but the catalyst rerum natura for surface area, pore volume, pore diameter etc. also has many motions, but finds now to reach satisfactory level as yet.
For example, as situation relevant for surface area, be the public clear 47-21081 of spy number, special public clear 52-10434 number, special public clear 53-5632 number, special public clear 55-36384 number, special public clear 56-24658 number, special public clear 56-28180 number, special public clear 58-29139 number, spy open clear 48-26690 number etc. in the communique record respectively at 1～50m 2The scope of/g., although the reaction temperature of specific these surface areas is very high, its active selection rate low or methacrylaldehyde is low, may not be sufficient as industrial catalyst.
In addition,, be disclosed in the spy and open and disclosedly in the clear 57-119837 communique be about pore volume, as pore volume, 0.2～0.4cc/g preferably, but embodiment discloses ammoxidation.
In addition, about pore diameter, opening clear 57-119837 communique the spy, to disclose preferably the average pore radius be 2000A or more than the 2000A, in the public clear 58-113141 communique of spy, disclose as pore diameter, the necessary less than 3% of the diameter littler than 100A, but all low in the disclosed activity of such catalysts of these communiques, do not possess as the performance for preparing methacrylaldehyde and acrylic acid industrial catalyst by propylene oxidation with high yield.
, be used for these catalyst for reaction,, can obtain high catalyst performance at least from effectively applying flexibly and the rationalization viewpoint of above-mentioned each reaction process of petroleum resources.That is, if feed stock conversion and selection rate improve 0.1%, the product amount that obtains is with the level increase of hundreds of～thousands of tons of.Therefore, the raising of the catalyst performance of feed stock conversion and selection rate etc. even improve a little, also can make effectively the applying flexibly and the rationalization of operation of petroleum resources significantly.
Summary of the invention
Therefore, the object of the present invention is to provide the higher catalyst of catalyst performance of feed stock conversion and selection rate etc., this catalyst is used for the gas phase catalysis ammoxidation reaction, and the selective reaction of dehydrogenation reaction etc. that prepared the catalytic gas phase oxidation of butadiene by butylene that are prepared the gas phase catalytic oxidation reaction of methacrylaldehyde or MAL, prepared acrylonitrile or methacrylonitrile by propylene or isobutene by propylene, isobutene or the tert-butyl alcohol.
Purpose of the present invention is by following realization.
1. composite oxide catalysts, this catalyst are to contain the catalyst that the olefin oxidation of molybdenum and bismuth is used, and it is characterized in that its specific area is at 5～25m 2/ g, its pore volume are in the scope of 0.2～0.7cc/g, and during its fine pore distributes, have following distribution: fine pore (diameter) the shared pore volume of the pore of 0.03～0.1 μ m be in total pore volume more than 30% or 30%, the shared pore volume of the pore of 0.1～1 μ m be in total pore volume more than 20% or 20%, and pore diameter is below 10% or 10% than the little proportion of 0.03 μ m.
2. composite oxide catalysts, it is used for preparing from propylene, isobutene or the tert-butyl alcohol gas phase catalytic reaction of methacrylaldehyde or MAL, the gas phase catalysis ammoxidation reaction for preparing acrylonitrile or methacrylonitrile from propylene or isobutene, and prepare arbitrary reaction the dehydrogenation reaction of catalytic gas phase oxidation of butadiene, and contain Mo, Bi and halogen as the composition element from butylene.
3. according to clauses and subclauses 1 or 2 described composite oxide catalysts, it is with following general formula (1) expression,
Mo aBi bCo cNi dFe eX fY gZ hSi iO j (1)
In the formula, X is from containing magnesium (Mg), calcium (Ca), zinc (Zn), cerium (Ce), at least a kind of element selecting among the group of samarium (Sm) and halogen, Y is from containing sodium (Na), potassium (K), rubidium (Rb), at least a kind of element selecting among the group of caesium (Cs) and thallium (T1), Z is from boracic (B), phosphorus (P), at least a kind of element selecting among the group of arsenic (As) and tungsten (W), in addition, a～j represents each atoms of elements ratio, during a=12, then be b=0.5～7, c=0～10, d=0～10 (but c+d=1～10), e=0.05～3, f=0～2, g=0.04～2, h=0～3, the scope of i=5～48, in addition, j is the numerical value of the state of oxidation that satisfies other element.
4. according to clauses and subclauses 1～3 any one described composite oxide catalysts, it is used for propylene oxide and prepares methacrylaldehyde and/or acrylic acid.
5. according to clauses and subclauses 1～4 any one described composite oxide catalysts, wherein above-mentioned halogen is a chlorine.
6. according to clauses and subclauses 1～5 any one described composite oxide catalysts, the content of above-mentioned halogen wherein is 0.0005～0.5 atomic weight for the Mo of 12 atomic weight.
7. the preparation method of a composite oxide catalysts, this method is through the supply source compound that comprises each the composition element homogenising and the operation of heating and prepare the method for clauses and subclauses 3 described composite oxide catalysts in water-based system, it is characterized in that, as at least a portion of molybdenum supply source compound, use molybdate compound and silicon-containing compound are carried out the aqueous dispersions that homogenising obtains in water-based system.
8. the preparation method of a composite oxide catalysts, this method is through the supply source compound that comprises each the composition element homogenising and the operation of heating and prepare the method for clauses and subclauses 3 described composite oxide catalysts in water-based system, it is characterized in that this method has and will contain molybdenum, iron, the raw material salt aqueous solution of at least a and silicon of nickel or cobalt or be dried after the dry thing that obtains carry out the catalyst precarsor preparation section of heat treated, with homogenising in aqueous solvent with this catalyst precarsor and bismuth compound, and carry out drying, the Preparation of Catalyst operation of roasting.
9. according to the preparation method of clauses and subclauses 8 described composite oxide catalysts, wherein the scorching hot decrement of catalyst precarsor is that 0.5～5 weight %, this scorching hot decrement are the values that obtains with following formula,
Scorching hot decrement (%)=[(W 0-W 1)/W 0] * 100
W 0: the weight (g) after under 150 ℃ catalyst precarsor being removed adhesive water in dry 3 hours
W 1: again in the 500 ℃ of above-mentioned catalyst precarsor heat treatment weight (g) after 2 hours that will remove adhesive water down.
10. the preparation method of a composite oxide catalysts, this method is through the supply source compound that comprises each the composition element homogenising and the operation of heating and prepare the method for clauses and subclauses 3 described composite oxide catalysts in water-based system, it is characterized in that, through containing the total atom a part of atomic ratio (a interior of suitable molybdenum than (a) 1) molybdenum, iron, nickel or cobalt at least a kind and the raw material salt aqueous solution of silicon or be dried the dry thing heat treated that obtains, the preceding operation of preparation catalyst precarsor and then through with this catalyst precarsor be equivalent to deduct above-mentioned a than (a) from the total atom of molybdenum 1Remaining atomic ratio (a 2) molybdenum and bismuth compound prepare with the back operation of aqueous solvent homogenising, drying, roasting.
11. the preparation method according to clauses and subclauses 10 described composite oxide catalysts is characterized in that, a 1Be 1＜a 1/ (c+d+e)＜3, a 2Be 0＜a 2The value of/b＜8.
12. the preparation method according to clauses and subclauses 10 described composite oxide catalysts is characterized in that, the aggregated particle in the waterborne suspension that adds silicon supply source compound is implemented dispersion treatment.
13. the preparation method according to clauses and subclauses 12 described composite oxide catalysts is characterized in that, the average grain diameter of the aggregated particle in the waterborne suspension is 0.1～10 μ m.
14. the preparation method according to clauses and subclauses 7～13 any one described composite oxide catalysts is characterized in that, 10～100 weight % of molybdenum supply source compound make molybdate compound and silicon-containing compound carry out the aqueous dispersions that homogenising obtains in water-based system.
15. the preparation method according to clauses and subclauses 7～14 any one described composite oxide catalysts is characterized in that, silicon-containing compound is a pyrogenic silica.
16. the preparation method according to clauses and subclauses 15 described composite oxide catalysts is characterized in that, the average diameter of the primary particle of pyrogenic silica is 15～50nm.
17. the preparation method according to clauses and subclauses 8～16 any one described composite oxide catalysts is characterized in that, the heating-up temperature in the catalyst precarsor preparation section is 200～400 ℃.
18. the preparation method according to clauses and subclauses 8～17 any one described composite oxide catalysts is characterized in that, when catalyst precarsor and bismuth compound are carried out homogenising in aqueous solvent, adds ammoniacal liquor.
19. the preparation method according to clauses and subclauses 8～17 any one described composite oxide catalysts is characterized in that, adds each composition of X, Y and Z in the Preparation of catalysts operation.
20. the preparation method according to clauses and subclauses 8～19 any one described composite oxide catalysts is characterized in that, the sintering temperature in the Preparation of catalysts operation is 450～650 ℃ a scope.
21. preparation method according to any one described composite oxide catalysts in the clauses and subclauses 7～14,17～20, when the operation preparation with homogenising in the water-based system of the supply source compound that comprises each composition element and heating contains the composite oxide catalysts of molybdenum and silicon at least, at least a portion as silicon supply source compound is used pyrogenic silica, and this pyrogenic silica is implemented dispersion treatment in advance become aggregated particle in aqueous dispersion medium, and be that the state of 0.1～5 μ m is supplied with to be dispersed into average grain diameter.
22. according to the preparation method of clauses and subclauses 21 described composite oxide catalysts, wherein 40～100 weight % of silicon supply source compound are above-mentioned pyrogenic silicas.
23. according to the preparation method of clauses and subclauses 21 or 22 described composite oxide catalysts, an average grain diameter that wherein imposes the pyrogenic silica of above-mentioned dispersion treatment is 15～50nm.
24., wherein use at least a of bismuth oxide or basic bismuth carbonate, and under 450～650 ℃, carry out heat treated as the bismuth supply source according to the preparation method of any one described composite oxide catalysts in the clauses and subclauses 7～23.
25. the preparation method according to any one described composite oxide catalysts in the clauses and subclauses 7～23 is characterized in that, as the bismuth supply source, and the basic bismuth carbonate of at least a portion of required sodium that used solid solution.
26. the preparation method according to any one described composite oxide catalysts in the clauses and subclauses 7～23 is characterized in that, as the bismuth supply source, use at least a portion contain the X composition bismuth and with the compound carbonate compound of X.
27. the preparation method according to any one described composite oxide catalysts in the clauses and subclauses 7～23 is characterized in that, as the bismuth supply source, uses bismuth of each at least a portion that contains required sodium and X composition and the compound carbonate compound of sodium and X.
28. with methacrylaldehyde and/or the method for producing acrylic acid of propylene, it is characterized in that, use the composite oxide catalysts of any one described method preparation in the clauses and subclauses 7～23 as raw material.
Below, detailed content of the present invention is described.
Each element of molybdenum (Mo), bismuth (Bi), silicon (Si), cobalt (Co), nickel (Ni), iron (Fe), magnesium (Mg), calcium (Ca), zinc (Zn), cerium (Ce), samarium (Sm), sodium (Na), potassium (K), rubidium (Rb), caesium (Cs), thallium (Tl), boron (B), phosphorus (P), arsenic (As), tungsten (W), fluorine (F), chlorine (Cl), bromine (Br), iodine (I) is suitable respectively to use the symbol of element in each bracket to represent.
The specific area of＜catalyst, pore volume, fine pore distribute 〉
The application's inventors find, at first, the catalyst rerum natura be not conventional art disclosed like that only by the surface of catalyst, only by pore volume or only by the fine pore decision that distributes, but the composite oxide catalysts of using at the olefin oxidation that contains molybdenum and bismuth, in particular for by in propylene production methacrylaldehyde and the acrylic acid catalyst, comprehensively determine by the three that the specific area of catalyst, pore volume, fine pore are distributed, thereby can obtain the good catalyst of selectivity of the growing amount of active high, desired substance.
That is, containing molybdenum and the bismuth olefin oxidation usefulness as necessary composition, prepare in methacrylaldehyde and the acrylic acid composite oxide catalysts in particular for propylene oxide, its specific area is at 5～25m 2/ g, its pore volume are in the scope of 0.2～0.7cc/g, and in its pore diameter distribution, the shared pore volume of pore that fine pore (diameter) has 0.03～0.1 a μ m be in total pore volume 30% or 30% or more, preferably 45～80% scope, the shared pore volume of pore with 0.1～1 μ m be total pore volume interior more than 20% or 20%, preferably during 25～60% scope, can obtain all high catalyst of activity, selectivity.Usually, little its specific area of pore and the pore volume in aperture is big, but in order to give selectivity to activity and effecting reaction product, only be little fine pore be inappropriate, can improve catalyst performance during pore coexistence by distributing with 0.1～1 μ m.
In addition, this said specific area be measure with the BET method of nitrogen adsorption, be the surface area of per unit weight catalyst, it is with the porosimeter of mercury penetration method pore diameter and pore volume and distribution thereof that measure, the per unit weight catalyst that pore volume and fine pore (diameter) distribute.
The importing of＜halogen 〉
Composite oxide catalysts of the present invention can contain Mo, Bi and halogen as the composition element.
Exist form not clear in the mechanism of action of the composite oxide catalysts preparation section of above-mentioned halogen and the above-mentioned composite oxide catalysts, but the import volume that can infer halogen should be brought into play effect with ormal weight for Bi, residual halogen should be micro-, then catalyst performance does not rely on residual halogen quantity, so in the heating process when the preparation composite oxide catalysts, when generating, the bismuth molybdate crystallization that is formed by Mo and Bi can promote thermal diffusion, increase the lattice defect of the oxygen in the bismuth molybdate crystallization, its result has caused, the raising of catalyst performance, particularly feed stock conversion.
As above-mentioned halogen, can enumerate F, Cl, Br, I, but wherein, Cl is effective.
The content of halogen of above-mentioned composite oxide catalysts is 0.0005～0.5 atomic weight, 0.0005～0.05 atomic weight preferably for the Mo of 12 atomic weight.If more than 0.5 atomic weight, catalyst performance reduces.On the other hand, also can lack, absorb the mensuration boundary of the chromatography of ions but 0.0005 atomic weight is the burning of measuring halogen quantity than 0.0005 atomic weight, owing to can not measure the amount of lacking than it, so can not confirm the existence of halogen.
In addition, the use amount of halogen when above-mentioned composite oxide catalysts is prepared is owing to the amount of using does not remain in the composite oxide catalysts fully, so be necessary to use more amount.Particularly, can be 25～50000ppm, preferably 50～5000ppm, 100～1000ppm more preferably for Bi.If lack than 25ppm, the importing effect of halogen can not be given full play to sometimes.On the other hand, if for a long time, cause the catalyst performance deterioration on the contrary sometimes than 50000ppm.Import volume is with the reason of Bi as benchmark, and as hereinafter described, this is because the importing of halogen is to use the basic bismuth carbonate powder that contains Bi and halogen to carry out, the cause that Bi is prepared easily as benchmark.
For above-mentioned composite oxide catalysts, as the composition element can use from Na and Mg, Ca, Zn, Ce, and Sm select more than a kind or 2 kinds or 2 kinds.
This Na can think, is using Na +(BiO) in the bismuth molybdate crystallization that generates in the above-mentioned composite oxide catalysts of ion exchange +During ion, can increase the lattice defect of oxygen.Consider ionic radius and above-mentioned Mg, the Ca that selects, the element of Zn, Sm etc., also be considered to have the lattice defect that increases the oxygen in the bismuth molybdate crystallization in the same manner with Na.No matter the sort of situation all can be thought because this lattice defect particularly improves with feed stock conversion and is related.
The content of the Na of above-mentioned composite oxide catalysts can be 0～1 atomic weight, 0.01～1 atomic weight preferably for the Mo of 12 atomic weight.If more than 1 atomic weight, often catalyst performance reduces.In addition, if addition lacks than 0.01 atomic weight, often can't see the effect of adding the catalyst performance raising that Na causes.
From Mg, the Ca of above-mentioned composite oxide catalysts, Zn, Ce, and the content of composition element more than a kind or 2 kinds or 2 kinds selected of Sm, can be 0～2 atomic weight, 0.01～1 atomic weight preferably for the Mo of 12 atomic weight.If more than 2 atomic weight, often catalyst performance reduces.In addition, if addition lacks than 0.01 atomic weight, the raising effect of then often adding the catalyst performance that the mentioned component element causes is insufficient.
In order further to improve the selection rate of above-mentioned composite oxide catalysts in above-mentioned each reaction, except each above-mentioned composition element, preferably add other atom such as K, Rb, Cs, Tl.Can think owing to these are that boundary or the surface that is present in each compound that constitutes composite oxide catalysts improved selectivity.
The general formula of＜catalyst 〉
Composite oxide catalysts of the present invention is represented with following general formula (1).
Mo aBi bCo cNi dFe eX fY gZ hSi iO j(1)
(in the formula, X is that at least a kind of element, the Y that select from the group that magnesium (Mg), calcium (Ca), zinc (Zn), cerium (Ce) and samarium (Sm) and halogen are formed are that at least a kind of element, the Z that selects from the group that sodium (Na), potassium (K), rubidium (Rb), caesium (Cs) and thallium (Tl) are formed is at least a kind of element selecting from the group that boron (B), phosphorus (P), arsenic (As) and tungsten (W) are formed.In addition, a～j represents each atoms of elements ratio, during a=12, it is the scope of b=0.5～7, c=0～10, d=0～10 (but c+d=1～10), e=0.05～3, f=0～2, g=0.04～2, h=0～3, i=5～48, in addition, j is the numerical value of the state of oxidation that satisfies other element.)
＜Preparation of catalysts method 〉
Composite oxide catalysts with particular characteristics of the present invention, it is the compound that contains each the composition element that constitutes above-mentioned composite oxide catalysts, be the compound that can make the aqueous solution or water slurry (below, be called " the supply source compound of composition element ".) dissolve respectively or be dispersed in the water, by be dried, moulding, roasting prepare.
In addition, composite oxide catalysts with particular characteristics of the present invention, can carry out the dry thing that drying obtains as its a part of raw material salt aqueous solution and carry out heat treated by containing at least a and silica in molybdenum, iron, nickel or the cobalt, after the preparation catalyst precursor powder, catalyst precursor powder and bismuth compound and water-soluble solvent are mixed together, are prepared through super-dry, moulding, roasting.
When preparation composite oxide catalysts of the present invention, in its preparation section, supply source compound as the silicon composition, use thermal decomposition silica (smog silica), supply source compound as the bismuth composition, following some except considering, be not particularly limited, that is, make up in following material (1) bismuth oxide or the basic bismuth carbonate any, (2) solid solution the basic bismuth carbonate of the needed Na of at least a portion, (3) contain the Bi of at least a portion composition and compound carbonate compound or Bi of difference at least a portion that (4) contain needed Na and X composition and the compound carbonate compound of Na and X of X.
It is when if preparation method's the object lesson of the composite oxide catalysts that the present invention relates to is shown, then as described below.
At first, at suitable molybdenum compound, preferably in the aqueous solution of ammonium molybdate, add the compound of iron, cobalt and nickel, preferably add the aqueous solution of each nitrate.Then, add compounds such as sodium, potassium, rubidium, thallium, boron, phosphorus, arsenic, tungsten, preferably add each water soluble salt as these aqueous solution forms.And then, add thermal decomposition silica.As this thermal decomposition silica is ultramicron shape anhydride silica, preferably uses the silica of average primary particle diameter 20～50nm of the silane preparation of in oxyhydrogen flame hydrolysis of silicon tetrachloride etc.
Then, add the bismuth meal end.As mentioned above, the bismuth meal end be in (1) bismuth oxide or the basic bismuth carbonate at least a, (2) solid solution the basic bismuth carbonate of the needed Na of at least a portion, (3) contain the Bi of at least a portion composition and compound carbonate compound or Bi of difference at least a portion that (4) contain needed Na and X composition and the compound carbonate compound of Na and X of X.Above-mentioned bismuth supply source compound is water-insoluble bismuth.This compound preferably uses with the form of powder.These compounds as the Preparation of Catalyst raw material also can be the particles bigger than powder, when still taking into account Xingqi thermal diffusion heating process, and preferably little particle.Therefore, when these compounds as raw material are not such small-particle, before heating process, should pulverize.
Then, after the slurries that obtain are stirred fully, carry out drying.Then, with drying particle or pie, in air, in 250～350 ℃ temperature province, carry out the heat treatment of short time.At this moment, in the heat treatment product that obtain, iron, cobalt and nickel have all formed the salt with acidic oxide, and the major part of bismuth compound then shows the form of raw material.This fact has confirmed that can be arbitrarily interpolation period of bismuth compound.
After the heat treatment product that will obtain like this with above-mentioned method are shaped to desirable shape, preferably, just can obtain composite oxide catalysts in the final heat treatment of carrying out under 450～650 ℃ the temperature conditions about 1～16 hour.
The raw material salt aqueous solution is the aqueous solution, aqueous slurry or the pie of at least a and silica in molybdenum, iron, nickel or the cobalt that contains as catalyst component.The preparation of this raw material salt aqueous solution generally is to be undertaken by the homogenising of the water-based system of the supply source compound of each composition element.
The preparation of composite oxide catalysts generally is to comprise with the mixing and the heating process of the water-soluble system of the supply source compound of each composition element to finish.
The mixing of the water-soluble system of the supply source compound of said above-mentioned each composition element is meant once or interimly mixes the aqueous solution of the supply source compound of each composition element and even aqueous dispersions or maturation process.Promptly, (1) method that each above-mentioned supply source compound is once mixed, (2) each above-mentioned supply source compound is once mixed, the method of maturation process, (3) method that each above-mentioned supply source compound is mixed interimly then, (4) each above-mentioned supply source compound interimly is mixed repeatedly the method for maturation process and with the method for (1)～(4) combinations, any method has all comprised the notion of mixing of water-soluble system of the supply source compound of above-mentioned each composition element.At this, said above-mentioned slaking is meant " raw material of industry or semi-finished product being handled, with the operation of the carrying out of seeking to obtain, improve necessary physical property, chemistry or regulation reaction etc. " (chemical voluminous dictionary/upright altogether the publication) under the condition of certain hour, uniform temperature etc.In addition, in the present invention, said above-mentioned certain hour is meant 10 minutes～24 hours scope, said above-mentioned uniform temperature is meant the scope of the boiling point of room temperature～aqueous solution and even aqueous dispersions.
And then above-mentioned homogenising is meant that not only the supply source compound of each element carries out above-mentioned processing, and comprises as required the carrier material as object such as the aluminium oxide that uses, silica alumina, fire resistance oxide.
In addition, said above-mentioned heating is meant the oxide of the complex chemical compound that generates for each oxide of the supply source compound that forms above-mentioned each composition element and composite oxides, by homogenising and the heat treatment of composite oxides, the final composite oxides of generation etc.And heating not necessarily is limited in 1 time.That is, this heating can at random be carried out in each stage of the represented homogenising in above-mentioned (1)～(4), in addition, also can append as required after homogenising.Above-mentioned heating-up temperature, normally 200 ℃～700 ℃ scope.
And then, in above-mentioned homogenising and add and pine for, except that these, also can or carry out for example drying, pulverizing, moulding etc. before and after it midway.
Most forming method by extrusion molding, compression molding, granulating and forming etc. such as the powder that obtains like this is molded into desirable shape and makes the catalyst goods.When this moulding, also can add the inorfil as the general known glass fibre of the effect that the intensity of improving catalyst, efflorescence degree are arranged etc., various whiskers etc.In addition, in order to control the repeatability of catalyst rerum natura well, also can use as the powder bond, for example general known additives such as ammonium nitrate, cellulose, starch, polyvinyl alcohol, stearic acid.
The supply source compound of each element during said preparation composite oxide catalysts not only is meant each compound for each element, and comprises the compound that contains simultaneously with multiple element (for example for ammonium phosphomolybdate of Mo and P etc.).
Contain the Mo compound for what prepare that above-mentioned Mo/Si homogenising dispersion liquid uses, just be not particularly limited as long as contain the compound of Mo, for example can enumerate the ammonium paramolybdate that uses as the supply source compound of above-mentioned Mo, molybdenum trioxide, molybdic acid, ammonium phosphomolybdate, phosphomolybdic acid etc.
In the supply source compound of these Mo,, can further improve the catalyst performance of the composite oxide catalysts that obtains if when using at least as the above-mentioned Mo/Si homogenising dispersion liquid of its part.
In addition, as the supply source compound of above-mentioned Si,, for example can enumerate silica, cataloid, pyrogenic silica etc. so long as be dispersed into 10 μ m or the compound below the 10 μ m is just passable by above-mentioned dispersion treatment.Wherein, the cataloid that preferably water dispersible is high, more preferably can obtain the pyrogenic silica of high selectivity.The supply source compound of these Si can be used as powder or powder body and uses, and in addition, also can make the slurries that are dispersed in the liquid and use.Whether carrying out in the dispersion treatment to above-mentioned waterborne suspension, as long as it is following to be distributed to 10 μ m or 10 μ m, to its shape, that is, be that block, granular, powdery, slurries shape etc. are all no problem.
Said above-mentioned pyrogenic silica is meant ultramicron shape anhydride silica, is in oxygen and hydrogen flame, and silanes hydrolysis such as silicon tetrachloride are made.With different with the silica of damp process preparation, 1 particle that exposes pyrogenic silica at high temperature in gas phase is just externally surperficial.This can think that the good selection rate for high feed stock conversion is extremely effective.
When stating pyrogenic silica in the use, its usage ratio can be to contain 40～100 weight % of Si total amount of compound, 60～100 weight % preferably.If lack, often can not get owing to add optionally effect of abundant raising that pyrogenic silica causes than 40 weight %.
In addition, above-mentioned pyrogenic silica after carrying out dispersion treatment for aggregated particle in advance in aqueous dispersion medium, to have disperseed state, that is, preferably uses the pyrogenic silica dispersion liquid.1 particle of pyrogenic silica has strong coherent set bulk state, when generally using the stirring vane stirring suspension in water, even also can form aggregated particle in decentralized medium.Present inventors, in the position of measuring, when being suspended in the pyrogenic silica of the average grain diameter 7～50nm of 1 particle in the ion exchange water with the stirring vane form, the average grain diameter of the aggregated particle in the water is the scope of 10～55 μ m.Carry out dispersion treatment for this aggregated particle, use 5 μ m or miniaturization to arrive below it.Can think that by such processing, the catalyst component that is mixed together with the Si composition is disperseed imperceptibly, feed stock conversion raising by leaps and bounds.
In aqueous dispersion medium,, also can utilize any principle in the flowing of medium, collision, pressure differential, the ultrasonic wave as the decentralized processing of the aggregated particle of pyrogenic silica.For example, can enumerate the process for dispersing that passes through rotational shear stream of homogenizer, homo-mixer, high-shear mixer etc.In addition, can enumerate the process for dispersing that utilizes orifice to shrink stream.And then, can enumerate and utilize hyperacoustic process for dispersing.
In addition, the dispersion treatment time is that time of 0.1～5 μ m is just enough as long as the average grain diameter of aggregated particle in aqueous dispersion medium of above-mentioned pyrogenic silica reaches, and other just are not particularly limited.In addition, also can carry out repeatedly such dispersion treatment.
The average grain diameter of the aggregated particle in the aqueous dispersion medium of the pyrogenic silica that has carried out above-mentioned dispersion treatment can be 0.1～5 μ m, preferably 0.15～3 μ m, more preferably 0.15～1 μ m, 0.15～0.5 μ m most preferably.If bigger, often can not get sufficient feed stock conversion than 5 μ m.On the other hand, than 0.1 μ m hour, thinking favourablely for the catalyst performance aspect, but is difficult technically, does not have the example of success so far.In addition, the average grain diameter of the aggregated particle in the aqueous dispersion medium of above-mentioned pyrogenic silica is with laser diffraction formula particle size distribution measuring method, measures according to the method for JISK1150 record.Determining instrument is to use the system LMS-24 of society of enterprise that progresses greatly, and average grain diameter makes 50% footpath of volume reference.
In addition, be not particularly limited, but the primary particle average diameter, preferably 15～50nm, 20～50nm more preferably for the physical property of above-mentioned pyrogenic silica.This average diameter also can be bigger than 50nm, but general preparation difficulty is difficult to obtain.On the other hand, if than 15nm hour, often the viscosity of waterborne suspension uprises operating difficulties.In addition, the primary particle average diameter of pyrogenic silica is measured the diameter of 1000～10000 primary particles with electron micrograph, with its mean value as an average grain diameter.
In the present invention, as being used for the aqueous medium that pyrogenic silica disperses, can use ion exchange water, distilled water etc.In order to make the fine dispersity stabilisation of above-mentioned pyrogenic silica, also can add various stabilization agents.Easy the reaching that never has impurity, operation seen economically, preferably directly uses ion exchange water or distilled water.
The suspension of above-mentioned pyrogenic silica or the silicon dioxide concentration in the dispersion liquid are 0.1～60 weight %, preferably 1～45 weight %, 10～30 weight % more preferably.If littler than 0.1 weight %, then the moisture quantitative change of adding as decentralized medium is big, in drying process, often is disadvantageous economically.On the other hand, if bigger than 60 weight %, the mobile extreme difference of dispersion liquid often is with the married operation of other catalyst components difficulty that becomes.
Chemical property for above-mentioned pyrogenic silica is not particularly limited, but owing to use in water-based system, so hydrophobization not preferably.
In the above-mentioned mixing mol ratio that contains the Mo compound and contain the Si compound that contains the Mo compound and contain when carrying out homogenising in the water-based system of Si compound is (molal quantity of the Mo that contains)/(molal quantity of the Si that contains)=0.001～100, preferably 0.02～24.If than 0.001 little, then, can not get sufficient catalyst performance as by containing the Mo compound and contain the Mo quantitative change that homogenising thing that the Si compound obtains supplies with little in the composite oxide catalysts.On the other hand, if, be difficult to obtain abundant effect of the present invention than 100 big, then not many with the Mo quantitative change that contains Si compound homogenising.
In the present invention,, will contain the Mo compound and contain the Si compound carries out homogenising in water-based system aqueous dispersions, contain in the Si compound so at first Mo is remained on owing to use though the mechanism that catalyst performance improves is unclear.At this, if add the Mo of above-mentioned Co, Ni, Fe etc. and the supply source compound of each the composition element beyond the Si, the Mo that then remains on the silicon can emit at leisure, can form the precursor of the composite oxides of being made up of each composition element beyond the Mo of above-mentioned Co, Ni, Fe etc. and the Si and Mo in heterogeneity.And in the homogenising of carrying out water-based system with when adding the thermosetting composite oxide catalysts, the above-mentioned precursor that has homogenized also forms composite oxides, becomes the constituent of catalyst.This raising that is considered to catalyst performances such as feed stock conversion and selection rates is favourable.
As above-mentioned composite oxides, can enumerate and contain the molybdenum composite oxides, that is, and the composite oxides of the various metals of each the composition element beyond molybdenum and Mo and the Si.As concrete example, can enumerate the composite oxides of Mo-Bi, the composite oxides of Mo-Co, the composite oxides of Mo-Ni, the composite oxides of Mo-Fe, the composite oxides of Mo-Mg, the composite oxides of Mo-Ca, the composite oxides of Mo-Zn, the composite oxides of Mo-Ce, the composite oxides of Mo-Sm, the composite oxides of Mo-Na, the composite oxides of Mo-K, the composite oxides of Mo-Rb, the composite oxides of Mo-Cs, the composite oxides of Mo-Tl, the composite oxides of Mo-B, the composite oxides of Mo-P, the composite oxides of Mo-As, the composite oxides of Mo-W etc.
Above-mentioned composite oxide catalysts, the homogenising of the water-based system of supply source compound that can be by being included in each the composition element that constitutes this composite oxide catalysts and the operation preparation of heating.
As above-mentioned supply source compound, can enumerate following object lesson.
When using Bi,, can enumerate bismuth nitrate, bismuth oxide, basic bismuth carbonate etc. as its supply source compound as the mentioned component element.
The basic bismuth carbonate mode of in addition, also can be used as solid solution Na and X composition (at least a kind of element selecting from be made of the group Mg, Ca, Zn, Ce and Sm) is supplied with.This solid solution the basic bismuth carbonate of this Na, be by in the aqueous solution of sodium carbonate or sodium acid carbonate etc., the aqueous solution of the water-soluble bismuth compound of the mixed nitrate bismuth that drips etc., with the precipitation that obtains wash, dry and prepare.In addition, solid solution the basic bismuth carbonate of X composition, be by in the aqueous solution of ammonium carbonate or carbonic hydroammonium etc., drip and mix the aqueous solution of forming by the water soluble compound of the nitrate of bismuth nitrate and X composition etc., with the precipitation that obtains wash, drying and preparing.If use sodium carbonate or sodium acid carbonate to replace above-mentioned ammonium carbonate or carbonic hydroammonium, the basic bismuth carbonate of then can prepare solid solution Na and X composition.
The compound carbonate compound of above-mentioned Bi or Bi and Na etc. preferably uses with the form of powder.As these compounds of Preparation of Catalyst raw material, also can be than big emboliform of powder, but if when taking into account the heating process of Xingqi thermal diffusion, preferably little particle, more preferably littler pulverous.Therefore, when not being Powdered, preferably before heating process, carry out pulverization process at the compound carbonate compound of above-mentioned Bi and Na.
And then, when using Na,, can enumerate sodium nitrate, borax etc. as its supply source compound as the mentioned component element.In addition, as mentioned above, also can be solid-solubilized on the basic bismuth carbonate and supply with.If use the compound carbonate compound of this Bi and Na, then can more improve the catalyst performance of the composite oxide catalysts that obtains.
In addition, when using Fe,, can enumerate ferric nitrate, ferric sulfate, iron chloride, ferric acetate etc. as its supply source compound as the mentioned component element.When using Co,, can enumerate cobalt nitrate, cobaltous sulfate, cobalt chloride, cobalt carbonate, cobalt acetate etc. as its supply source compound as the mentioned component element.When using Ni,, can enumerate nickel nitrate, nickelous sulfate, nickel chloride, nickelous carbonate, nickel acetate etc. as its supply source compound as the mentioned component element.
In addition, when using X composition (at least a kind of element from the group who forms by Mg, Ca, Zn, Ce and Sm, selecting) as the mentioned component element, as its supply source compound, can enumerate nitrate compound, sulphate cpd, chloride, carbonate compound, acetate compound of these elements etc.In addition, as mentioned above, also can be solid-solubilized on the basic bismuth carbonate and supply with.
In addition, when using K,, can enumerate potassium nitrate, potassium sulfate, potassium chloride, potash, potassium acetate etc. as its supply source compound as the mentioned component element.When using Rb,, can enumerate rubidium nitrate, rubidium sulfate, rubidium chloride, rubidium carbonate, acetic acid rubidium etc. as its supply source compound as the mentioned component element.When using Cs,, can enumerate cesium nitrate, cesium sulfate, cesium chloride, cesium carbonate, cesium acetate etc. as its supply source compound as the mentioned component element.When using Tl,, can enumerate thallous nitrate, thallous chloride, thallous carbonate, thallium acetate etc. as its supply source compound as the mentioned component element.
When using B,, can enumerate borax, ammonium borate, boric acid etc. as its supply source compound as the mentioned component element.When using P,, can enumerate ammonium phosphomolybdate, ammonium phosphate, phosphoric acid, five phosphorous oxide etc. as its supply source compound as the mentioned component element.When using As,, can enumerate two arsenic, ten ammonium octamolybdates, two arsenic, 18 ammonium tungstates etc. as its supply source compound as the mentioned component element.When using W,, can enumerate ammonium paratungstate, tungstic acid, wolframic acid, phosphotungstic acid etc. as its supply source compound as the mentioned component element.
In addition,, put down in writing in the time of can using the above-mentioned Mo/Si homogenising aqueous dispersions of preparation, but except this aqueous dispersions, also can append above-mentioned starting compound and use as the supply source compound of Si.
The object lesson of the preparation method of the composite oxide catalysts of representing with above-mentioned general formula (1) below is shown.In addition, think documents such as above-mentioned document and other, the concrete example that relates to other in the known moment by this concrete example for this specially a dealer be easy.
At first, for example make the Si compound homogenising in water-based system that contains that contains Mo compound and pyrogenic silica etc. of ammonium paramolybdate etc. mix preparation Mo/Si homogenising dispersion liquid.
With the supply source compound of above-mentioned Mo/Si homogenising dispersion liquid as Mo and Si, therein, each the supply source compound that adds Fe, Co, Ni, Mg, Ca, Zn, Cs, Na, K, Rb, Cs, Tl, B, P, As, W etc. as required for example adds each water soluble salt.Then, add the supply source compound of the supply source compound of above-mentioned Bi and Na, the compound carbonate compound of Bi and Na preferably.
Then, after the suspension that obtains or slurries are stirred fully, carry out drying.Dry particle or pie carry out the heat treatment of short time in 250～350 ℃ temperature province in air.With heat treatment product obtaining like this with extrusion molding, compression molding or carry method figurations such as holding moulding and become shape arbitrarily.Then, with this formed body,, thus, prepare composite oxide catalysts of the present invention preferably in the final heat treatment of carrying out under 450～650 ℃ the temperature conditions about 1～16 hour.
Supply source compound as Bi and Na, when use contains the basic bismuth carbonate of Na, in the heat treatment product that heat treatment by the above-mentioned short time obtains, iron, cobalt and nickel have formed the salt with acidic oxide, and the major part that contains the basic bismuth carbonate of Na then shows the form of raw material.Before the interpolation that this means the basic bismuth carbonate that contains Na is not limited to the heat treatment of above-mentioned short time period, also can be after the heat treatment of this short time and obtain arbitrarily.
On the other hand, because the interpolation of Mo/Si homogenising aqueous dispersions is supplied with as aqueous liquid dispersion period, more can bring into play effect so in than the operation before the heat treatment of above-mentioned short time, add.
The addition of each supply source compound of above-mentioned preparation method is set just passable as long as meet the constituent ratio ground of formation element of the composite oxide catalysts of above-mentioned general formula (1) expression.
Composite oxide catalysts with above-mentioned general formula (1) expression, when preparing through comprising the supply source compound that makes each composition element in water-based system, to carry out the operation of homogenising and heating, need to prepare through preceding operation and back operation, operation is as its part before said, will contain the total atom a part of atomic ratio (a interior than (a) of the molybdenum that is equivalent to general formula (1) 1) molybdenum, iron, nickel or cobalt at least a kind and the silica containing raw material salt aqueous solution or be dried the dry thing heat treated that obtains, the preceding operation of preparation catalyst precarsor, said back operation are preceding operation after this catalyst precarsor and the total atom that is equivalent to from the molybdenum of general formula (1) to be deducted above-mentioned a than (a) 1Remaining atomic ratio (a 2) molybdenum and bismuth compound with the aqueous solvent homogenising, dry, roasting.
The scorching hot decrement of the catalyst precarsor that obtains after the heat treated, preferably 0.5～5 weight %, 1～3 weight % more preferably.Scorching hot decrement is made this scope, can obtain the high catalyst of feed stock conversion and selection rate.In this scorching hot decrement is the value that obtains with following formula.
Scorching hot decrement (%)=[(W 0-W 1)/W 0] * 100
W 0: under 150 ℃, catalyst precarsor was removed the weight behind the attached water (g) in dry 3 hours
W 1: in the 500 ℃ of above-mentioned catalyst precarsors that will remove the down adhesive water weight (g) of heat treatment after 2 hours again
The total atom of the molybdenum of catalyst of the present invention is 12 than a, is divided into atomic ratio a in preceding operation and back operation 1And a 2The atomic ratio a of this moment 1And a 2Value, preferably make following relation respectively.That is a, 1Be to satisfy 1＜a 1/ (c+d+e)＜3, a 2Be to satisfy 0＜a 2The value of/b＜8.
Then, as must composition Bi and halogen, and the supply source compound of the composition element of selecting as selection component Na and/or by Mg, Ca, Zn, Ce and Sm of forming more than a kind or 2 kinds or 2 kinds (below, abbreviate " the supply source compounds of Bi etc. " as.), can enumerate the compound carbonate compound that contains following Bi, just contain halogen as necessary composition, and as selection component, Na and/or the composition element of forming more than a kind or 2 kinds or 2 kinds selected by Mg, Ca, Zn, Ce and Sm (below, be called " halogen etc. ".)。As this example, can enumerate the basic bismuth carbonate that contains water-insoluble halogen etc.This compound can be by the water-soluble bismuth compound of the mixed nitrate bismuth that drips in the mixed liquor of the aqueous solution of the water-soluble halide of the aqueous solution of the carbonate of ammonium carbonate, carbonic hydroammonium etc. and/or bicarbonate and ammonium halide etc. etc., with the sediment that obtains wash, dry and make.
In order to contain Na, as carbonate and/or bicarbonate, can use the aqueous solution of sodium carbonate or sodium acid carbonate, as halide, can use the aqueous solution of sodium halide.And then, in order to contain the element of selecting by Mg, Ca, Zn, Ce and Sm more than a kind and 2 kinds or 2 kinds, aqueous solution of nitrate of these elements etc. etc. can be blended in the aqueous solution of water-soluble bismuth compound of bismuth nitrate etc. and use.The addition of Bi, Na, Mg, Ca, Zn, Ce and Sm of this moment will meet the content of above-mentioned composite oxide catalysts and adjusts.In addition, the amount of halogen will meet amount described later and adjusts.
The basic bismuth carbonate that contains above-mentioned water-insoluble halogen etc. preferably uses with the form of powder.As these compounds of Preparation of Catalyst raw material, can be the particle bigger than powder, but if small-particle preferably when taking into account the heating process of Xingqi thermal diffusion.Therefore, when being not such small-particle, should before heating process, pulverize as these compounds of raw material.
Below, when using Cl, the preparation method's of the composite oxide catalysts of representing with above-mentioned general formula (1) object lesson is shown as halogen.In addition, above-mentioned patent documentation and other etc., the concrete example that relates to other in the known moment by this concrete example for this specially a dealer be easy.
At first, at the supply source compound of suitable Mo, for example add the supply source compound of Fe, Co and Ni in the aqueous solution of ammonium paramolybdate, for example the aqueous solution of each nitrate.And then with each supply source compound of Na, K, Cs, Rb, Tl, B, P, As, W etc., for example each water soluble salt joins in the above-mentioned aqueous solution.And then, add the supply source compound of the Si of granular or cataloid, pyrogenic silica etc. as required.Thus, supply source compound water solution or the suspension of preparation Mo etc.
Then, as the compound carbonate compound of the Bi that contains halogen etc., preparation contains the basic bismuth carbonate of halogen.
This obtains by the following method, just prepare bismuth-containing compound, the aqueous solution of bismuth nitrate for example, it is splashed into to be mixed into contain the Cl compound, the for example aqueous solution of ammonium chloride and carbon containing acid ion or heavy carbonic ionic compound, for example in the mixed liquor of the aqueous solution of ammonium carbonate or carbonic hydroammonium, with the slurries that obtain wash, dry and obtain.For selection component contains Na, can use sodium chloride, can use sodium carbonate or sodium acid carbonate as carbon containing acid ion or heavy carbonic ionic compound as containing the Cl compound.In addition, in order to contain Mg, Ca, Zn, Ce and Sm etc., for example these the aqueous solution of nitrate etc. can be used in the aqueous solution of bismuth nitrate.By above-mentioned preparation method, in the basic bismuth carbonate that contains halogen etc., contain Na or Mg, Ca, Zn, Ce or Sm.
Then, in the supply source compound water solution of above-mentioned Mo etc. or suspension, mix the basic bismuth carbonate powder that contains halogen etc.Then, after the suspension that obtains or slurries are stirred fully, carry out drying.Dry particle or pie carry out the heat treatment of short time in 250～350 ℃ temperature province in air.
With extrusion molding, compression molding or carry the heat treatment product that the method for holding moulding etc. will obtain like this and be configured as shape arbitrarily.Then, with this formed body, preferably in the final heat treatment of carrying out under 450～650 ℃ the temperature conditions about 1～16 hour.Thus, prepare composite oxide catalysts of the present invention.
In the heat treatment product that the heat treatment by the above-mentioned short time obtains, formed salt with respect to iron, cobalt and nickel, and the major part that contains the basic bismuth carbonate of halogen etc. shows the form of raw material with acidic oxide.This means the interpolation period of the basic bismuth carbonate that contains halogen etc., be not limited to before the heat treatment of above-mentioned short time, also can be the heat treatment of this short time after, welcome obtaining.
Therefore, as mentioned above, except the method that adopts homogenising after mixing all supply source compounds, heating and short time or heat for a long time, also can carry out following method, be about to above-mentioned supply source compound beyond the supply source compound of the compound carbonate compound of Bi of halogen-containing grade and Si in water-based system after homogenising and the heating, mix the compound carbonate compound of Bi of halogen-containing grade and the supply source compound of Si, in water-based system, carry out homogenising and heating after the moulding.In addition, because Si has the effect as carrier, so all no problem in any stage interpolation.
The addition of each supply source compound of above-mentioned preparation method is as long as it is just passable to set the constituent ratio of formation element of the composite oxide catalysts that meets above-mentioned general formula (1) expression for.
In addition, when preparation contains the basic bismuth carbonate powder of above-mentioned halogen etc., contain the Bi compound and contain the Na compound, contain Mg, the addition of at least a kind of compound in Ca, Zn, Ce or Sm any a kind, set the amount that makes Bi, Na, Mg, Ca, Zn, Ce or Sm for and meet with the constituent ratio of the formation element of the composite oxide catalysts of above-mentioned general formula (1) expression just passable.In addition, the addition that contains the Cl compound, because the whole Cl that import do not remain in the composite oxide catalysts, so be necessary to import more amount, particularly, Cl amount can be added into 25～50000 ppm by weight for Bi, preferably adds into 50～5000 ppm by weight, most preferably adds into 100～1000 ppm by weight.If lack than 25 ppm by weight, the thermal diffusion in the time of then can not promoting fully to generate the bismuth molybdate crystallization often can not fully increase the lattice defect of the oxygen in the above-mentioned bismuth molybdate crystallization.On the other hand, as if more, cause the deterioration of catalyst performance on the contrary than 50000 ppm by weight.
In addition, with the atomicity of the halogen in the composite oxide catalysts of above-mentioned general formula (1) expression, that is, the value of j can be 0～0.5, preferably 0.0005～0.5 in above-mentioned preparation method.If the value of j is than more than 0.5, often catalyst performance reduces.On the other hand, the value of j is 0, promptly also can not exist halogen also passable in the composite oxide catalysts of the usefulness that above-mentioned preparation method obtains above-mentioned (1) expression.In addition, the value of j surpasses 0 to 0.0005 hour, is that the burning of measuring halogen quantity absorbs below the mensuration boundary of the chromatography of ions, can judge j=0.Even J is in 0～0.0005 scope, when in above-mentioned preparation method, preparing catalyst, add halogen, the bismuth molybdate crystallization of thermal diffusion when generating to(for) abundant promotion is favourable, can fully increase the lattice defect of the oxygen in the above-mentioned bismuth molybdate crystallization, so in this preparation method, even the halogen quantity in the composite oxide catalysts that finally obtains also can reach purpose of the present invention detecting below the boundary.
Composite oxide catalysts with this method preparation can use the various gas phase catalytic oxidation reactions that carried out in the presence of molecularity oxygen.
Example at this said gas phase catalytic oxidation reaction, can enumerate above-mentioned reaction, that is, by the reaction of preparation methacrylaldehyde such as propylene, isobutene or the tert-butyl alcohol or MAL, under the coexistence of ammonia, prepare the reaction of acrylonitrile or methacrylonitrile, prepare the reaction of butadiene etc. from butylene from propylene or isobutene.
Use the catalytic gas phase oxidation reaction of composite oxide catalysts of the present invention to be undertaken by following, promptly, propylene, the molecularity oxygen of 5～18 capacity %, the steam of 0～60 capacity % and the inert gas of 20～70 capacity % of 1～10 capacity % that will form as unstrpped gas, the mist formed such as nitrogen, carbon dioxide gas for example, import on the catalyst of above-mentioned preparation under temperature ranges of 250～450 ℃ and normal pressure～10 pressure by air pressure, be 0.5～10 second time of contact.
Experimental example
Propylene conversion, methacrylaldehyde selection rate, acrylic acid selection rate, methacrylaldehyde yield, acrylic acid yield, total yield are defined as follows.
Propylene conversion (mole %)=(molal quantity of the propylene of the molal quantity/supply of the propylene that has reacted) * 100
Methacrylaldehyde selection rate (mole %)=(molal quantity of the propylene of the molal quantity/reaction of the methacrylaldehyde of generation) * 100
Acrylic acid selection rate (mole %)=(molal quantity of the propylene of the acrylic acid molal quantity/reaction of generation) * 100
Methacrylaldehyde yield (mole %)=(molal quantity of the propylene of the molal quantity/supply of the methacrylaldehyde of generation) * 100
Acrylic acid yield (mole %)=(molal quantity of the propylene of the acrylic acid molal quantity/supply of generation) * 100
Total recovery (mole %)=methacrylaldehyde yield (mole %)+acrylic acid yield (mole %)
＜specific areas etc. are confirmed experiment to the effect of rerum natura 〉
[experimental example 1]
At first, ammonium paramolybdate 94.1g is heated, is dissolved in the 400ml pure water.Then, ferric nitrate 7.18g, cobalt nitrate 25.8g and nickel nitrate 37.8g are heated in the 60ml pure water, dissolve.The limit is fully stirred on these solution limits mixes at leisure.
Then, heat down, be dissolved in borax 0.85g and potassium nitrate 0.36g in the 40ml pure water after, add in the above-mentioned slurries.Then, add thermal decomposition silica (pyrogenic silica) (average primary particle diameter 40nm) 48g, fully stir.Then, the basic bismuth carbonate 58.1g of 0.57% Na that added solid solution mixes.Behind this slurries heat drying, under air atmosphere, carry out 300 ℃/1 hour heat treatment.With the granular solids compressing tablet form diameter 5mm that obtains, the tablet of height 4mm, then carry out 500 ℃/4 hours roasting with the small formed machine, make composite oxide catalysts.
As follows from the atomic ratio that adds the composite oxide catalysts that raw material calculates.
Mo∶Bi∶Co∶Ni∶Fe∶Na∶B∶K∶Si＝12∶5∶2∶3∶0.4∶0.39∶0.2∶0.08∶18
[experimental example 2]
Ammonium paramolybdate 94.1g is heated, is dissolved in the 400ml pure water.Then, ferric nitrate 7.18g, cobalt nitrate 25.8g and nickel nitrate 37.8g are heated, are dissolved in the 60ml pure water.The limit is fully stirred on these solution limits mixes at leisure.
Then, heat down, be dissolved in borax 0.85g and potassium nitrate 0.36g in the 40ml pure water after, add in the above-mentioned slurries.Then, add thermal decomposition silica (average primary particle diameter 40nm) 48g, fully stir.Behind this slurries heat drying, under air atmosphere, carry out 300 ℃/1 hour heat treatment.The granular solids that obtains is pulverized, be dispersed among the pure water 150ml that adds ammoniacal liquor 10ml.Then, the basic bismuth carbonate 58.1g of 0.52% Na that added solid solution mixes.Behind this slurries heat drying, with the small formed machine with the granular solids compressing tablet that obtains be shaped as diameter 5mm, the height 4mm tablet, then carry out 500 ℃/4 hours roasting, make catalyst.
From the catalyst that adds raw material calculating is the composite oxides with following atomic ratio.
Mo∶Bi∶Co∶Ni∶Fe∶Na∶B∶K∶Si＝12∶5∶2∶3∶0.4∶0.37∶0.2∶0.08∶18
[experimental example 3]
Ammonium paramolybdate 54g is heated, is dissolved among the pure water 250ml.Then, ferric nitrate 7.18g, cobalt nitrate 25.8g and nickel nitrate 37.8g are heated down, are dissolved among the pure water 60ml.The limit is fully stirred on these solution limits mixes at leisure.
Then, add thermal decomposition silica 48g, fully stir.Behind this slurries heat drying, under air atmosphere, carry out 300 ℃/1 hour heat treatment.Granular solids (scorching hot decrement: 1.3 weight %) pulverize, ammonium paramolybdate 40.1g is distributed in the solution that adds ammoniacal liquor 10ml in pure water 150ml with the catalyst precarsor that obtains.Then, borax 0.85g and potassium nitrate 0.36g are heated down, are dissolved among the pure water 40ml, add in the above-mentioned slurries.Then, the basic bismuth carbonate 58.1g of 0.45% Na that added solid solution mixes.
Behind this slurries heat drying, with the small formed machine with the granular solids compression molding that obtains become diameter 5mm, the height 4mm tablet, then carry out 500 ℃/4 hours roasting, make catalyst.
From the catalyst that adds raw material calculating is the composite oxides with following atomic ratio.
Mo∶Bi∶Co∶Ni∶Fe∶Na∶B∶K∶Si＝12∶5∶2∶3∶0.4∶0.35∶0.2∶0.08∶18
The atomic ratio a of the molybdenum during preparation 1And a 2Be respectively 6.9 and 5.1.
[comparative experiments example 1]
Except using the cataloid as silica material, experimental example 1 carries out the preparation of composite oxide catalysts in the same manner, the physical property measurement of the specific area of the composite oxide catalysts that obtains has been shown in table 1, and has used the composite oxide catalysts that obtains to implement the result of propylene oxidation reaction.
[comparative experiments example 2]
Preparation is during with the catalyst of experimental example 2 same compositions, except bismuth raw material and other raw material add simultaneously, and use outside the cataloid as silica material, carry out the preparation of composite oxide catalysts in the same manner with experimental example 2, the physical property measurement of the specific area etc. of the composite oxide catalysts that operation like this obtains has been shown in table 1, and has implemented the result of the oxidation reaction of propylene in the same manner with experimental example 2.
[comparative experiments example 3]
Prepare catalyst as follows with experimental example 3 same compositions.Ammonium molybdate 94.1g heated be dissolved among the pure water 400ml.Then, ferric nitrate 7.18g, cobalt nitrate 25.8g and nickel nitrate 37.8g are heated be dissolved among the pure water 60ml.The limit is fully stirred on these solution limits mixes at leisure.
Then, borax 0.85g and potassium nitrate 0.36g heated to be dissolved among the pure water 40ml, joins in the above-mentioned slurries.Then add cataloid 240g (SiO wherein 2Content be 20 weight %) after fully stir.Behind these slurries of heat drying, under air atmosphere, carry out 300 ℃/1 hour heat treatment.The granular solids that pulverizing obtains is distributed in the solution that adds ammoniacal liquor 10ml in pure water 500ml.Then, the basic bismuth carbonate 58.1g of 0.45% Na that added solid solution mixes.Behind this slurries heat drying, with the granular solids compressing tablet form diameter 5mm that obtains, the tablet of height 4mm, then carry out 500 ℃/4 hours roasting with the small formed machine, make catalyst.Like this, need not separate under the molybdenum composition supply source, add X, Y simultaneously, the Z composition is prepared, and as silica material except using cataloid, similarly use the composite oxide catalysts that has prepared with experimental example 3, in table 1, represented similarly to implement the result of the oxidation reaction of propylene with experimental example 3.
(mensuration of the rerum natura of the composite oxide catalysts of experimental example 1～3, comparative experiments example 1～3)
Specific area, pore volume and the pore of measuring the composite oxide catalysts of above-mentioned preparation in accordance with the following methods distribute.It the results are shown in the table 1.
In addition, specific area is to measure with the BET method of nitrogen absorption.Determining instrument uses big storehouse reason development AMS-8000 type.
In addition, pore volume and pore distribute and measure with mercury penetration method.Determining instrument uses the system Port ア サ イ ザ 9310-PC2 of (strain) Shimadzu Seisakusho Ltd. type.
(oxidation reaction of propylene)
Use the oxidation reaction of the composite oxide catalysts enforcement propylene of above-mentioned preparation, calculate propylene conversion, methacrylaldehyde yield, acrylic acid yield.
Composite oxide catalysts 20ml is filled into how the having in tower (Na イ -) the jacketed reaction pipe of stainless steel of internal diameter 15mm, under normal pressure, pass through the unstrpped gas of density of propylene 10%, vapour concentration 17% and air concentration 73%, 2.0 seconds times of contact of experimental example 1 and comparative experiments example 1,310 ℃, 1.8 seconds times of contact of experimental example 2 and comparative experiments example 2,305 ℃, under 1.8 seconds times of contact of experimental example 3 and comparative experiments example 3,300 ℃ the reactive bath technique temperature, implement the oxidation reaction of propylene, obtained the result shown in the table 1.
In addition, in table 1, the ratio of said pore volume is meant the ratio of the shared pore volume of the pore of the pore of 0.03～0.1 μ m or 0.1～1 μ m for total pore volume.
Table 1
Specific area Pore volume The ratio of pore volume (0.03～0.1 μ m) The ratio of pore volume (0.1～1 μ m) Propylene conversion The methacrylaldehyde yield The acrylic acid yield
Experimental example 1 18.8 0.35 68 23 98.2 90.3 4.5
Experimental example 2 17.7 0.36 63 28 98.0 90.3 4.3
Experiment row 3 17.0 0.36 60 35 99.0 90.7 4.6
Comparative experiments example 1 29.0 0.32 70 10 98.1 88.2 4.1
Comparative experiments example 2 28.9 0.32 69 10 95.5 86.4 3.3
Comparative experiments example 3 27.5 0.33 68 11 96.5 87.3 3.4
The specific area of the composite oxide catalysts that obtains in the comparative experiments example 1,2,3 is excessive, and the pore volume of 0.1～1 μ m is very few, and methacrylaldehyde yield, acrylic acid yield are lower than experimental example 1,2,3.
The effect in interpolation period of＜Bi raw material is confirmed experiment 〉
[experimental example 4]
Ammonium paramolybdate 94.1 is heated, is dissolved among the pure water 400ml.Then, ferric nitrate 7.18g, cobalt nitrate 25.8g and nickel nitrate 37.8g are heated, are dissolved in pure water 60ml.The limit is fully stirred on these solution limits mixes at leisure.
Then, in pure water 40ml, heat, dissolve borax 0.85g and potassium nitrate 0.36g, join in the above-mentioned slurries.Then add silica 64g, fully stir.Behind this slurries heat drying, under air atmosphere gas, carry out 300 ℃/1 hour heat treatment.Behind the granular solids that pulverizing obtains, be dispersed in the pure water of the 150ml that has added 10ml ammoniacal liquor.Then, the basic bismuth carbonate 58.1g of 0.45% Na that added solid solution mixes.Behind this slurries heat drying, with the granular solids compressing tablet form diameter 5mm that obtains, the tablet of height 4mm, then carry out 500 ℃/4 hours roasting with the small formed machine, make catalyst.
From the catalyst that adds raw material calculating is the composite oxides with following atomic ratio.
Mo∶Bi∶Co∶Ni∶Fe∶Na∶B∶K∶Si＝12∶5∶2∶3∶0.4∶0.35∶0.2∶0.08∶24
(oxidation reaction condition of the propylene of embodiment 4)
Composite oxide catalysts 20ml is filled into how the having in the tower jacketed reaction pipe of stainless steel of internal diameter 15mm, pass through the unstrpped gas of density of propylene 10%, vapour concentration 17% and air concentration 73% at normal pressure, under 1.8 seconds times of contact, when implementing the oxidation reaction of propylene, under 300 ℃ reactive bath technique temperature, obtained the result shown in the table 2.
[comparative experiments example 4]
Use the catalyst with experimental example 3 same compositions, except Bi raw material and other raw material added simultaneously, the composite oxide catalysts that same operation prepares was implemented the oxidation reaction of propylene in the same manner with experimental example 4, and it the results are shown in table 2.
Table 2
Propylene conversion The methacrylaldehyde yield The acrylic acid yield
Experimental example 4 98.5 90.6 4.5
Comparative experiments example 4 96.6 88.8 3.8
The effect of the interpolation generation in period of＜Mo composition is confirmed experiment 〉
[experimental example 5]
Ammonium paramolybdate 54g is heated, is dissolved among the pure water 250ml.Then, ferric nitrate 7.18g, cobalt nitrate 31.8g and nickel nitrate 31.8g are heated, are dissolved in pure water 60ml.The limit is fully stirred on these solution limits mixes at leisure.
Then, add silica 64g, fully stir.Behind this slurries heat drying, under air atmosphere gas, carry out 300 ℃/1 hour heat treatment.Granular solids (scorching hot decrement: 1.4 weight %) pulverize, ammonium paramolybdate 40.1g is distributed in the solution that has added ammoniacal liquor 10ml among the pure water 150ml with the catalyst precarsor that obtains.Then, after pure water 40ml heats dissolving borax 0.85g and potassium nitrate 0.36g, join in the above-mentioned slurries.The basic bismuth carbonate 58.1g of 0.45% Na that then added solid solution mixes.
Behind this slurries heat drying, with the granular solids compressing tablet form diameter 5mm that obtains, the tablet of height 4mm, then carry out 500 ℃/4 hours roasting with the small formed machine, make catalyst.
From adding the catalyst that raw material calculated is the composite oxides with following atomic ratio.
Mo∶Bi∶Co∶Ni∶Fe∶Na∶B∶K∶Si＝12∶5∶2.5∶2.5∶0.4∶0.35∶0.2∶0.08∶24
The atomic ratio a of the molybdenum during preparation 1And a 2Be respectively 6.9 and 5.1.
(oxidation reaction condition of the propylene of embodiment 5)
Composite oxide catalysts 20ml is filled into how the having in the tower jacketed reaction pipe of stainless steel of internal diameter 15mm, pass through the unstrpped gas of density of propylene 10%, vapour concentration 17% and air concentration 73% at normal pressure, under 1.8 seconds times of contact, when implementing the oxidation reaction of propylene, under 305 ℃ reactive bath technique temperature, obtained the result shown in the table 3.
[comparative experiments example 5]
Catalyst according to following operation preparation and experimental example 5 same compositions.Ammonium paramolybdate 94.1g heated be dissolved among the pure water 400ml.Then, ferric nitrate 7.18g, cobalt nitrate 31.8g and nickel nitrate 31.8g are heated be dissolved among the pure water 60ml.The limit is fully stirred on these solution limits mixes at leisure.
Then, borax 0.85g and potassium nitrate 0.36g heated to be dissolved among the pure water 40ml, joins in the above-mentioned slurries.Fully stir after then adding silica 64g.Behind these slurries of heat drying, under air atmosphere, carry out 300 ℃/1 hour heat treatment.The granular solids that pulverizing obtains is distributed in the solution that (has added ammoniacal liquor 10ml) among the pure water 150ml.Then, the basic bismuth carbonate 58.1g of 0.45% Na that added solid solution mixes.Behind this slurries heat drying, with the granular solids compressing tablet form diameter 5mm that obtains, the tablet of height 4mm, then carry out 500 ℃/4 hours roasting with the small formed machine, make catalyst.Like this, except separating under the molybdenum composition supply source, add simultaneously beyond X, Y, the Z composition, use the composite oxide catalysts with experimental example 5 same operation preparations, implement the propylene oxidation identical with experimental example 5 and react, it the results are shown in table 3.
Table 3
Propylene conversion The methacrylaldehyde yield The acrylic acid yield
Experimental example 5 99.1 90.8 4.7
Comparative experiments example 5 95.4 87.8 3.6
The affirmation experiment of the effect that＜interpolation halogen produces 〉
[experimental example 6]
Ammonium paramolybdate 94.1g is heated, is dissolved among the pure water 400ml.Then, ferric nitrate 7.18g, cobalt nitrate 25.8g and nickel nitrate 38.7g are heated, are dissolved in pure water 60ml.The limit is fully stirred on these two solution limits mixes at leisure.Then, add in this mixed liquor, borax 0.85g and potassium nitrate 0.36g are heated is dissolved in liquid among the pure water 40ml, fully stirs the aqueous solution of the supply source compound of preparation molybdenum etc.
Then, bismuth nitrate 100g is dissolved in nitric acid and makes it to become in the acid ion exchange water.And with sodium carbonate 42.0g and sodium chloride 0.3g heating for dissolving in ion exchange water.The limit is fully stirred on these two solution limits mixes at leisure.Mix the white depositions that the back washing and filtering obtains, and dry.The chlorine of the basic bismuth carbonate of the halogen-containing grade that obtains and the content of sodium are respectively 0.18 weight % and 0.52 weight %.
Then, mix after in the aqueous solution of the supply source compound of above-mentioned Mo etc., adding the basic bismuth carbonate powder 58.1g that contains above-mentioned halogen etc. and silica 64g.
Then, behind this slurries heat drying, under air atmosphere, give 300 ℃/1 hour heat treatment.With the granular solids compressing tablet form diameter 5mm that obtains, the tablet of height 4mm, then in Ma Fu (マ Star Off Le) stove, carry out 500 ℃/4 hours roasting with the small formed machine, make composite oxide catalysts.
As described in Table 4 from the ratio of components of the metal ingredient that adds the above-mentioned composite oxide catalysts that raw material calculated.On the other hand with the CI amount in the following method mensuration composite oxide catalysts.Its atomic ratio is shown in table 4.
This composite oxide catalysts 20ml is filled into how the having in the tower jacketed reaction pipe of stainless steel of internal diameter 15mm, pass through the unstrpped gas of density of propylene 10%, vapour concentration 17% and air concentration 73% at normal pressure, under 2.3 seconds times of contact, when implementing the oxidation reaction of propylene, under 310 ℃ reaction temperature, obtained the reaction result shown in the table 5.
(assay method of CI amount)
Use burning to absorb ion-chromatographic determination.Just, in analytic sample, add combustion adjuvant, be heated to 1100 ℃, make the gas that generates be dissolved in the pure water, quantitative with chromatography of ions.
[comparative experiments example 6]
In the ion exchange water that bismuth nitrate 100g has been dissolved in the nitric acid acidification.And, with sodium carbonate 42.0g heating for dissolving in ion exchange water.The limit is fully stirred on these two solution limits mixes at leisure.After mixing, the white depositions that washing and filtering obtains, and dry.The content of the sodium of the basic bismuth carbonate that obtains is 0.53 weight %.
The basic bismuth carbonate that contains above-mentioned Na except use replaces the basic bismuth carbonate that contains halogen etc. of experimental example 6, and other and embodiment 6 prepare composite oxide catalysts in the same manner, the oxidation reaction of enforcement propylene.The composition of the metal ingredient of the above-mentioned composite oxide catalysts when reaction result under 310 ℃ is shown in Table 5.
[experimental example 7]
In the ion exchange water that bismuth nitrate 100g and magnesium nitrate 25g have been dissolved in the nitric acid acidification.In addition, with ammonium carbonate 38.1g and ammonium chloride 0.3g heating for dissolving in ion exchange water.The limit is fully stirred on these two solution limits mixes at leisure.After mixing, the white depositions that washing and filtering obtains, and dry.The chlorine of the basic bismuth carbonate of the halogen-containing grade that obtains and the content of magnesium are respectively 0.09 weight % and 0.83 weight %.
The basic bismuth carbonate powder that contains above-mentioned halogen etc. except use replaces the basic bismuth carbonate that contains halogen etc. of record in the experimental example 6, and other and embodiment 6 prepare composite oxide catalysts in the same manner, the oxidation reaction of enforcement propylene.The composition of the metal ingredient of the above-mentioned composite oxide catalysts when reaction result under 310 ℃ of the reaction temperatures is shown in Table 5.
[comparative experiments example 7]
In the ion exchange water that bismuth nitrate 100g and magnesium nitrate 25g have been dissolved in the nitric acid acidification.In addition, with ammonium carbonate 38.1g heating for dissolving in ion exchange water.The limit is fully stirred on these two solution limits mixes at leisure.After mixing, the white depositions that washing and filtering obtains, and dry.The content of the magnesium of the basic bismuth carbonate that contains magnesium that obtains is 0.83 weight %.
The basic bismuth carbonate powder that contains above-mentioned magnesium except use replaces the basic bismuth carbonate that contains halogen etc. of record in the experimental example 6, and other and experimental example 6 prepare composite oxide catalysts in the same manner, the oxidation reaction of enforcement propylene.The composition of the metal ingredient of the above-mentioned composite oxide catalysts when reaction result under 310 ℃ of the reaction temperatures is shown in Table 5.
[experimental example 8]
In the ion exchange water that bismuth nitrate 100g and calcium nitrate 25g have been dissolved in the nitric acid acidification.In addition, with sodium carbonate 42g and sodium chloride 0.3g heating for dissolving in ion exchange water.The limit is fully stirred on these two solution limits mixes at leisure.After mixing, the white depositions that washing and filtering obtains, and dry.The content of chlorine, sodium and the calcium of the basic bismuth carbonate of the halogen-containing grade that obtains is respectively 0.09 weight %, 0.45 weight % and 0.30 weight %.
The basic bismuth carbonate powder that contains above-mentioned halogen etc. except use replaces the basic bismuth carbonate that contains halogen etc. of record in the experimental example 6, and other and experimental example 1 prepare composite oxide catalysts in the same manner, the oxidation reaction of enforcement propylene.The composition of the metal ingredient of the above-mentioned composite oxide catalysts when reaction result under 310 ℃ of the reaction temperatures is shown in Table 5.
[experimental example 9～12]
Being compounded in metal species in the basic bismuth carbonate of halogen-containing grade and amount and chloride ion amount, to become the value shown in the table 6 such, prepares the basic bismuth carbonate of halogen-containing grade, and in addition other and experimental example 6 prepare the catalyst shown in the table 4 in the same manner.Then, use these catalyst, carry out reaction with experimental example 6 the same terms.The combination of the metal ingredient of the above-mentioned composite oxide catalysts when reaction result of 310 ℃ of reaction temperatures is as shown in table 5.
[comparative experiments example 8]
In the ion exchange water that bismuth nitrate 100g and calcium nitrate 25g have been dissolved in the nitric acid acidification.In addition, with sodium carbonate 42g heating for dissolving in ion exchange water.The limit is fully stirred on these two solution limits mixes at leisure.After mixing, the white depositions that washing and filtering obtains, and dry.The calcium of the basic bismuth carbonate of the calcic that obtains etc. and the content of sodium are respectively 0.30 weight %, 0.45 weight %.
The basic bismuth carbonate powder that contains above-mentioned calcium except use replaces the basic bismuth carbonate that contains halogen etc. of experimental example 6 records, and other and experimental example 6 prepare composite oxide catalysts in the same manner, the oxidation reaction of enforcement propylene.The composition of the metal ingredient of the above-mentioned composite oxide catalysts when reaction result under 310 ℃ of the reaction temperatures is shown in Table 5.
(result)
Show from the result of experimental example 5 and comparative experiments example 6,,, can improve propylene conversion 0.3% for not influence of selection rate by Cl is joined in the composite oxide catalysts.
In addition, show,, when suppressing the reduction of selection rate, and can improve propylene conversion 0.8%, so can improve total recovery 0.4% by Cl is joined in the composite oxide catalysts from the result of experimental example 7 and comparative experiments example 7.
And then, show from the result of experimental example 8 and comparative experiments example 8, by Cl is joined in the composite oxides, improve selection rate 0.3%, improve propylene conversion 0.2%, so can improve total recovery 0.5%.
And then, also confirm the effect identical at experimental example 9～12 with experimental example 8.
Table 4
Catalyst is formed (atomic ratio)
Mo Bi Co Ni Fe Na Mg Ca Zn Ce Sm B K Cl Si
Experimental example 6 12 5 2 3 0.4 0.4 - - - - - 0.2 0.08 0.02 24
Experimental example 7 12 5 2 3 0.4 0.1 0.4 - - - - 0.2 0.08 0.01 24
Experimental example 8 12 5 2 3 0.4 0.35 - 0.1 - - - 0.2 0.08 0.01 24
Experimental example 9 12 5 2 3 0.4 0.35 0.2 - - - - 0.2 0.08 0.01 24
Experimental example 10 12 5 2 3 0.4 0.35 - - 0.06 - - 0.2 0.08 0.01 24
Experimental example 11 12 5 2 3 0.4 0.35 - - - 0.03 - 0.2 0.08 0.01 24
Experimental example 12 12 5 2 3 0.4 0.35 - - - - 0.03 0.2 0.08 0.01 24
Comparative experiments example 6 12 5 2 3 0.4 0.4 - - - - - 0.2 0.08 - 24
Comparative experiments example 7 12 5 2 3 0.4 0.1 0.4 - - - - 0.2 0.08 - 24
Comparative experiments example 8 12 5 2 3 0.4 0.35 - 0.1 - - - 0.2 0.08 - 24
Table 5
Propylene conversion The methacrylaldehyde selection rate The acrylic acid selection rate The methacrylaldehyde yield The acrylic acid yield Add up to yield
Experimental example 6 99.0 91.9 4.6 91.0 4.6 95.6
Experimental example 7 98.9 92.9 2.4 91.9 2.4 94.3
Experimental example 8 99.2 92.2 4.3 91.5 4.3 95.8
Experimental example 9 99.2 92.7 3.6 92.0 3.6 95.6
Experimental example 10 99.0 93.5 2.9 92.6 2.9 95.5
Experimental example 11 99.3 91.9 4.2 91.3 4.2 95.5
Experimental example 12 99.2 91.7 4.3 91.0 4.3 95.3
Comparative experiments example 6 98.7 91.9 4.5 90.7 4.4 95.1
Comparative experiments example 7 98.1 91.6 4.1 89.9 4.0 93.9
Comparative experiments example 8 98.9 91.7 4.7 90.7 4.6 95.3
Table 6
Cl amount (weight %) Na amount (weight %) The Q composition
Kind Amount (weight %)
Experimental example 9 0.09 0.45 Mg 0.3
Experimental example 10 0.09 0.45 Zn 0.3
Experimental example 11 0.06 0.45 Ce 0.3
Experimental example 12 0.06 0.45 Sm 0.3
＜confirm to use the effect of Mo/Si homogenising dispersion liquid generation to test 〉
[experimental example 13]
Ammonium paramolybdate 94.1g is heated, is dissolved among the pure water 400ml.Then, ア エ ロ ジ Le (Japanese ア エ ロ ジ Le society system) 64g is joined among the pure water 256ml and stirs.These two solution are slowly mixed, fully stir, obtain aqueous dispersions up to being faint yellow.Then, ferric nitrate 8.97g, cobalt nitrate 32.3g and nickel nitrate 32.3g are heated, are dissolved among the ion exchange water 60ml, be blended in the above-mentioned aqueous dispersions and stir at leisure.Add in this mixed liquor, borax 1.69g and potassium nitrate 0.45g are heated is dissolved in liquid among the pure water 40ml, fully stirs.
Then, bismuth nitrate 100g is dissolved in nitric acid make its acidification ion exchange water in.In addition, with sodium carbonate 42.0g heating for dissolving in ion exchange water.The limit is fully stirred on these two solution limits mixes at leisure.After mixing, the white depositions that washing and filtering obtains, and dry.The content of the sodium of the basic bismuth carbonate that obtains is 0.53 weight %.
The basic bismuth carbonate 34.7g of the white of the above-mentioned Na of compound 0.53 weight % joined in the above-mentioned mixed liquor mix.Then, behind this slurries heat drying, under air atmosphere, carry out 300 ℃/1 hour heat treatment.With the small formed machine with the granular solids compressing tablet that obtains be shaped as diameter 5mm, the height 4mm tablet, then in groom's stove, carry out 500 ℃/4 hours roasting, make catalyst.
As follows from the ratio of components of the metal ingredient that adds the catalyst that raw material calculated.
Mo∶Bi∶Co∶Ni∶Fe∶Na∶B∶K∶Si＝12∶3∶2.5∶2.5∶0.5∶0.4∶0.4∶0.1∶24
This catalyst 20ml is filled into how the having in the tower jacketed reaction pipe of stainless steel of internal diameter 15mm, pass through the unstrpped gas of density of propylene 10%, vapour concentration 17% and air concentration 73% at normal pressure, under 2.0 seconds times of contact, when under 310 ℃ reaction temperature, implementing the oxidation reaction of propylene, obtained the reaction result shown in the table 7.
[comparative experiments example 9]
Ammonium paramolybdate 94.1g is heated, is dissolved among the pure water 400ml.Then, ferric nitrate 8.97g, cobalt nitrate 32.3g and nickel nitrate 32.3g are heated, are dissolved in ion exchange water 60ml.The limit is fully stirred on these two solution limits mixes at leisure.Then, add in this solution, borax 1.69g and potassium nitrate 0.45g are heated is dissolved in liquid among the ion exchange water 40ml, fully stirs.The basic bismuth carbonate 58.1g of the white of the Na that in experimental example 13, uses that then, adds 0.35 weight % compound.And then, be added among the pure water 250ml stirring liquid that adds ア エ ロ ジ Le (Japanese ア エ ロ ジ Le society system) 64g, mix.
Then, behind this slurries heat drying, under air atmosphere, carry out 300 ℃/1 hour heat treatment.With the small formed machine with the granular solids compressing tablet that obtains be shaped as diameter 5mm, the height 4mm tablet, then in muffle furnace, carry out 500 ℃/4 hours roasting, make catalyst.As follows from the ratio of components of the metal ingredient that adds the catalyst that raw material calculated.
Mo∶Bi∶Co∶Ni∶Fe∶Na∶B∶K∶Si＝12∶3∶2.5∶2.5∶0.5∶0.4∶0.4∶0.1∶24
This catalyst 20ml is filled into how the having in the tower jacketed reaction pipe of stainless steel of internal diameter 15mm, pass through the unstrpped gas of density of propylene 10%, vapour concentration 17% and air concentration 73% at normal pressure, under 2.0 seconds times of contact, when under 310 ℃ reaction temperature, implementing the oxidation reaction of propylene, obtained the reaction result shown in the table 7.
Table 7
Propylene conversion (%) Methacrylaldehyde selection rate (%) Acrylic acid selection rate (%) Methacrylaldehyde yield (%) Acrylic acid yield (%) Add up to yield (%)
Experimental example 13 98.6 93.7 3.4 92.4 3.4 95.8
Comparative experiments example 9 98.1 94.5 2.5 92.7 2.5 95.2
(result)
Can find out significantly from the result of experimental example 13 and comparative experiments example 9, by using the Mo/Si homogenising dispersion liquid of regulation, propylene conversion can be improved about 0.5%, the total of methacrylaldehyde selection rate and acrylic acid selection rate can improve 0.1% simultaneously, adds up to yield can improve 0.6%.
Effect during＜dispersion treatment aggregated particle is confirmed experiment 〉
[experimental example 14]
Ammonium paramolybdate 94.1g is heated, is dissolved among the ion exchange water 400ml.Then, ferric nitrate 8.97g, cobalt nitrate 32.3g and nickel nitrate 32.3g are heated, are dissolved in ion exchange water 60ml.The limit is fully stirred on these two liquid limits mixes at leisure.Then, in this solution, add ア エ ロ ジ Le (Japanese ア エ ロ ジ Le society system) 64g, stir.With the waterborne suspension that obtains with homogenizer (the system LK-21 of ヤ マ ト society) dispersion treatment 20 minutes.The average grain diameter of the aggregated particle in the dispersion liquid after the dispersion treatment is 0.6 μ m.In addition, the average grain diameter of the aggregated particle in this dispersion liquid is measured with the system LMS-24 of society of セ イ シ Application enterprise.
Then, bismuth nitrate 100g is dissolved in nitric acid make its acidification ion exchange water in.In addition, with sodium carbonate 42.0g heating for dissolving in ion exchange water.The limit is fully stirred on these two solution limits mixes at leisure.After mixing, the white depositions that washing and filtering obtains, and dry.The content of the sodium of the basic bismuth carbonate that contains sodium etc. that obtains is 0.53 weight %.
Then, add in the waterborne suspension after above-mentioned dispersion treatment, heat at ion exchange water 40ml and dissolved the liquid of borax 1.69g and potassium nitrate 0.45g, fully stir, and then add the basic bismuth carbonate 34.7g that contains above-mentioned sodium, under atmospheric pressure fully mix.Then, behind this slurries heat drying, under air atmosphere, carry out 300 ℃/1 hour heat treatment.With the small formed machine with the granular solids compressing tablet that obtains be shaped as diameter 5mm, the height 4mm tablet, in muffle furnace, carry out 500 ℃/4 hours roasting then, obtain composite oxide catalysts.
As follows from the ratio of components of the metal ingredient that adds the catalyst that raw material calculated.
Mo∶Bi∶Co∶Ni∶Fe∶Na∶B∶K∶Si＝12∶3∶2.5∶2.5∶0.5∶0.4∶0.4∶0.1∶24
This composite oxide catalysts 20ml is filled into how the having in the tower jacketed reaction pipe of stainless steel of internal diameter 15mm, pass through the unstrpped gas of density of propylene 10%, vapour concentration 17% and air concentration 73% at normal pressure, under 2.0 seconds times of contact, when implementing the oxidation reaction of propylene, under 310 ℃ reaction temperature, obtained the reaction result shown in the table 8.
[comparative experiments example 10]
Except carrying out the dispersion treatment with homogenizer (the system LK-21 of ヤ マ ト society), prepare composite oxide catalysts in the same manner with embodiment 14, implement the oxidation reaction of propylene.As follows from the ratio of components of the metal ingredient that adds the catalyst that raw material calculated.
Mo∶Bi∶Co∶Ni∶Fe∶Na∶B∶K∶Si＝12∶3∶2.5∶2.5∶0.5∶0.4∶0.4∶0.1∶24
In addition, the reaction result during 310 ℃ of reaction temperatures as shown below.
(result)
Can find out significantly from the result of experimental example 14 and comparative experiments example 10, by carrying out dispersion treatment, almost under the condition of keeping methacrylaldehyde selection rate and acrylic acid selection rate, propylene conversion can be improved about 0.9%, add up to yield to improve about 0.7%.
Table 8
Propylene conversion (%) Methacrylaldehyde selection rate (%) Acrylic acid selection rate (%) Methacrylaldehyde yield (%) Acrylic acid yield (%) Add up to yield (%)
Experimental example 14 98.5 92.3 4.7 90.9 4.6 95.5
Comparative experiments example 10 97.6 92.5 4.6 90.3 4.5 94.8
Effect during＜dispersion treatment pyrogenic silica is confirmed experiment 〉
[experimental example 15]
320g joins among the ion exchange water 1280ml with ア エ ロ ジ Le (Japanese ア エ ロ ジ Le society system), and the suspension that obtains carried out dispersion treatment 20 minutes with homogenizer (the system LK-21 of ヤ マ ト society).The average grain diameter of the pyrogenic silica dispersion liquid after the dispersion treatment is 0.3 μ m.And the average grain diameter of pyrogenic silica dispersion liquid is measured with the system LMS-24 of society of セ イ シ Application enterprise.
Ammonium paramolybdate 94.1g is heated, is dissolved among the ion exchange water 400ml.Then, ferric nitrate 8.97g, cobalt nitrate 32.3g and nickel nitrate 32.3g are heated, are dissolved among the ion exchange water 60ml.The limit is fully stirred on these two solution limits mixes at leisure.Then, add in this mixed liquor, borax 1.69g and potassium nitrate 0.45g are heated is dissolved in liquid among the ion exchange water 40ml, fully stirs.
Then, bismuth nitrate 100g is dissolved in nitric acid make its acidification ion exchange water in.In addition, with sodium carbonate 42.0g heating for dissolving in ion exchange water.The limit is fully stirred on these two solution limits mixes at leisure.After mixing, the white depositions that washing and filtering obtains, and dry.The content of the sodium of the basic bismuth carbonate that contains sodium etc. that obtains is 0.53 weight %.
Then, the basic bismuth carbonate 34.7g that contains Na that obtains and above-mentioned aerosolization silica dispersion liquid 320g are joined in the aqueous solution of above-mentioned supply source compound, mix.Behind this slurries heat drying, under air atmosphere, carry out 300 ℃/1 hour heat treatment.With the small formed machine with the granular solids compressing tablet that obtains be shaped as diameter 5mm, the height 4mm tablet, then in muffle furnace, carry out 500 ℃/4 hours roasting, obtain composite oxide catalysts.
As follows from the ratio of components of the metal ingredient that adds the catalyst that raw material calculated.
Mo∶Bi∶Co∶Ni∶Fe∶Na∶B∶K∶Si＝12∶3∶2.5∶2.5∶0.5∶0.4∶0.4∶0.1∶24
This catalyst 20ml is filled into how the having in the tower jacketed reaction pipe of stainless steel of internal diameter 15mm, pass through the unstrpped gas of density of propylene 10%, vapour concentration 17% and air concentration 73% at normal pressure, under 2.0 seconds times of contact, when implementing the oxidation reaction of propylene, under 310 ℃ reaction temperature, obtained the reaction result shown in the table 9.
[comparative experiments example 11]
320g joins among the ion exchange water 1280ml and suspends with ア エ ロ ジ Le (Japanese ア エ ロ ジ Le society system).The average grain diameter of suspension is 52 μ m.
Except the supply source compound as Si uses the suspension of above-mentioned ア エ ロ ジ Le, prepare composite oxide catalysts in the same manner with experimental example 15, implement the oxidation reaction of propylene.
As follows from the ratio of components of the metal ingredient that adds the catalyst that raw material calculated.
Mo∶Bi∶Co∶Ni∶Fe∶Na∶B∶K∶Si＝12∶3∶2.5∶2.5∶0.5∶0.4∶0.4∶0.1∶24
In addition, the reaction result during 310 ℃ of reaction temperatures is shown in table 9.
[comparative experiments example 12]
Except use ア エ ロ ジ Le (Japanese ア エ ロ ジ Le society system) powder 64g as the supply source compound of Si, prepare composite oxide catalysts in the same manner with experimental example 15, implement the oxidation reaction of propylene.As follows from the ratio of components of the metal ingredient that adds the catalyst that raw material calculated.
Mo∶Bi∶Co∶Ni∶Fe∶Na∶B∶K∶Si＝12∶3∶2.5∶2.5∶0.5∶0.4∶0.4∶0.1∶24
In addition, the reaction result during 310 ℃ of reaction temperatures is shown in table 9.
Table 9
Propylene conversion (%) Methacrylaldehyde selection rate (%) Acrylic acid selection rate (%) Methacrylaldehyde yield (%) Acrylic acid yield (%) Add up to yield (%)
Experimental example 15 99.0 95.2 1.6 94.2 1.6 95.8
Comparative experiments example 11 98.0 94.7 2.4 92.8 2.4 95.2
Comparative experiments example 12 97.9 95.2 2.1 93.2 2.1 95.3
(result)
Can find out significantly from the result of experimental example 15 and comparative experiments example 11 and 22, by using the pyrogenic silica of regulation, almost under the condition of keeping methacrylaldehyde selection rate and acrylic acid selection rate, propylene conversion can be improved about 1.0～1.1%, so add up to yield can improve 0.5～0.6%.
The invention effect
As previously discussed, according to the present invention, as the gas phase catalytic reaction that is used for preparing from propylene, isobutene or the tert-butyl alcohol methacrylaldehyde or MAL, the gas phase catalysis ammoxidation reaction for preparing acrylonitrile or methacrylonitrile from propylene or isobutene, and the catalyst the optionally reaction of the dehydrogenation reaction of the catalytic gas phase oxidation when butylene prepares butadiene etc., can obtain the catalyst that the catalyst performance of feed stock conversion and selection rate etc. further improves.

Claims (20)

1. the preparation method of a composite oxide catalysts, wherein this catalyst is to contain the catalyst that the olefin oxidation of molybdenum and bismuth is used, and it is characterized in that its specific area is at 5～25m 2/ g, its pore volume are in the scope of 0.2～0.7cc/g, and during its fine pore distributes, have following distribution: fine pore (diameter) the shared pore volume of the pore of 0.03～0.1 μ m be in total pore volume more than 30% or 30%, the shared pore volume of the pore of 0.1～1 μ m be in total pore volume more than 20% or 20%, and pore diameter is below 10% or 10% than the little proportion of 0.03 μ m, and this composite oxide catalysts is represented by following general formula (1):
Mo aBi bCo cNi dFe eX fY gZ hSi iO j (1)
In the formula, X is from by magnesium (Mg), calcium (Ca), zinc (Zn), cerium (Ce), at least a kind of element selecting among the group that samarium (Sm) and halogen are formed, Y is from by sodium (Na), potassium (K), rubidium (Rb), at least a kind of element selecting among the group that caesium (Cs) and thallium (Tl) are formed, Z is from by boron (B), phosphorus (P), at least a kind of element selecting among the group that arsenic (As) and tungsten (W) are formed, in addition, a～j represents each atoms of elements ratio, a=12, b=0.5～7, c=0～10, d=0～10, c+d=1～10 wherein, e=0.05～3, f=0～2, g=0.04～2, h=0～3, i=5～48, in addition, j is the numerical value of the state of oxidation that satisfies other element
This method process comprises the operation of the integrated and heating of supply source compound in water-based system of each composition element, it is characterized in that, through containing the total atom a part of atomic ratio (a interior than (a) of suitable molybdenum 1) molybdenum, iron, nickel or cobalt at least a kind and contain the raw material salt aqueous solution of silicon or be dried the dry thing heat treated that obtains, the preceding operation of preparation catalyst precarsor, and then through with this catalyst precarsor and be equivalent to deduct above-mentioned a from the total atom of molybdenum than (a) 1Remaining atomic ratio (a 2) molybdenum and bismuth compound is integrated, dry with aqueous solvent, the back operation of roasting and preparing.
2. the preparation method of composite oxide catalysts according to claim 1 is characterized in that, a 1Be 1＜a 1/ (c+d+e)＜3, a 2Be 0＜a 2The value of/b＜8.
3. the preparation method of composite oxide catalysts according to claim 1 and 2, wherein the scorching hot decrement of catalyst precarsor is that 0.5～5 weight %, this scorching hot decrement are the values that obtains with following formula,
Scorching hot decrement (%)=[(W 0-W 1)/W 0] * 100
W 0: the weight (g) after under 150 ℃ catalyst precarsor being removed adhesive water in dry 3 hours
W 1: again in the 500 ℃ of above-mentioned catalyst precarsor heat treatment weight (g) after 2 hours that will remove adhesive water down.
4. the preparation method of composite oxide catalysts according to claim 1 is characterized in that, the aggregated particle in the waterborne suspension that adds silicon supply source compound is implemented dispersion treatment.
5. the preparation method of composite oxide catalysts according to claim 4 is characterized in that, the average grain diameter of the aggregated particle in the waterborne suspension is 0.1～10 μ m.
6. according to claim 1,2 and the preparation method of any one described composite oxide catalysts of 4-5, it is characterized in that 10～100 weight % of molybdenum supply source compound make molybdate compound and silicon-containing compound carry out the integrated aqueous dispersions that obtains in water-based system.
7. according to claim 1,2 and the preparation method of any one described composite oxide catalysts of 4-5, it is characterized in that silicon-containing compound is a pyrogenic silica.
8. the preparation method of composite oxide catalysts according to claim 7 is characterized in that, the average diameter of the primary particle of pyrogenic silica is 15～50nm.
9. according to claim 1,2 and the preparation method of any one described composite oxide catalysts of 4-5, it is characterized in that the heating-up temperature in the catalyst precarsor preparation section is 200～400 ℃.
10. according to claim 1,2 and the preparation method of any one described composite oxide catalysts of 4-5, it is characterized in that, catalyst precarsor and bismuth compound are carried out adding ammoniacal liquor when integrated in aqueous solvent.
11. according to claim 1,2 and the preparation method of any one described composite oxide catalysts of 4-5, it is characterized in that, in the Preparation of catalysts operation, add each composition of X, Y and Z.
12., it is characterized in that the sintering temperature in the Preparation of catalysts operation is 450～650 ℃ a scope according to claim 1,2 and the preparation method of any one described composite oxide catalysts of 4-5.
13. according to claim 1,2 and 4-5 in the preparation method of any one described composite oxide catalysts, when the operation preparation with the integrated and heating in the water-based system of the supply source compound that comprises each composition element contains the composite oxide catalysts of molybdenum and silicon at least, at least a portion as silicon supply source compound, use pyrogenic silica, and this pyrogenic silica is implemented dispersion treatment in advance become aggregated particle in aqueous dispersion medium, and be that the state of 0.1～5 μ m is supplied with to be dispersed into average grain diameter.
14. the preparation method of composite oxide catalysts according to claim 13, wherein 40～100 weight % of silicon supply source compound are above-mentioned pyrogenic silicas.
15. the preparation method of composite oxide catalysts according to claim 13, an average grain diameter that wherein imposes the pyrogenic silica of above-mentioned dispersion treatment is 15～50nm.
16. according to claim 1,2 and 4-5 in the preparation method of any one described composite oxide catalysts, wherein as the bismuth supply source, use at least a of bismuth oxide or basic bismuth carbonate, and under 450～650 ℃, carry out heat treated.
17. according to claim 1,2 and 4-5 in the preparation method of any one described composite oxide catalysts, it is characterized in that, as the bismuth supply source, the basic bismuth carbonate of at least a portion of required sodium that used solid solution.
18. according to claim 1,2 and 4-5 in the preparation method of any one described composite oxide catalysts, it is characterized in that, as the bismuth supply source, use bismuth of at least a portion that contains the X composition and the compound carbonate compound of X.
19. according to claim 1,2 and 4-5 in the preparation method of any one described composite oxide catalysts, it is characterized in that, as the bismuth supply source, use bismuth of each at least a portion that contains required sodium and X composition and the compound carbonate compound of sodium and X.
20. the method from propylene manufacturing methacrylaldehyde and/or acrylic acid gas phase catalytic oxidation reaction is characterized in that, uses the composite oxide catalysts of any one described method preparation among claim 1-2 and the 4-5.
CN2007101063915A 2001-11-08 2002-11-08 Composite oxide catalyst and method for preparation thereof Expired - Lifetime CN101066528B (en)

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