CN108862315A - A kind of preparation method of SAPO-56/SAPO-34 composite molecular screen - Google Patents
A kind of preparation method of SAPO-56/SAPO-34 composite molecular screen Download PDFInfo
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- CN108862315A CN108862315A CN201810716151.5A CN201810716151A CN108862315A CN 108862315 A CN108862315 A CN 108862315A CN 201810716151 A CN201810716151 A CN 201810716151A CN 108862315 A CN108862315 A CN 108862315A
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
- C01B39/00—Compounds having molecular sieve and base-exchange properties, e.g. crystalline zeolites; Their preparation; After-treatment, e.g. ion-exchange or dealumination
- C01B39/54—Phosphates, e.g. APO or SAPO compounds
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
- C01B37/00—Compounds having molecular sieve properties but not having base-exchange properties
- C01B37/06—Aluminophosphates containing other elements, e.g. metals, boron
- C01B37/08—Silicoaluminophosphates (SAPO compounds), e.g. CoSAPO
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
- C01P2002/00—Crystal-structural characteristics
- C01P2002/70—Crystal-structural characteristics defined by measured X-ray, neutron or electron diffraction data
- C01P2002/72—Crystal-structural characteristics defined by measured X-ray, neutron or electron diffraction data by d-values or two theta-values, e.g. as X-ray diagram
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- C—CHEMISTRY; METALLURGY
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- C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
- C01P2004/00—Particle morphology
- C01P2004/01—Particle morphology depicted by an image
- C01P2004/03—Particle morphology depicted by an image obtained by SEM
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
- C01P2004/00—Particle morphology
- C01P2004/80—Particles consisting of a mixture of two or more inorganic phases
Abstract
The invention discloses one kind with N, N, N, N- tetramethyl -1, the preparation method of 6- hexamethylene diamine and triethylamine synthesis SAPO-56/34 composite molecular screen, first by N, N, N, N- tetramethyl -1,6- hexamethylene diamine and triethylamine are thoroughly mixed uniformly, are added in aqueous solution to obtain mixed solution later；Silicon source, silicon source are added sequentially in mixed solution, stirring a period of time to being completely dissolved, is then added dropwise phosphoric acid and stirs the gel that is uniformly mixed for a period of time；Gained mixture is transferred in autoclave, after crystallization, by solid product by deionized water washing, filtering, dry, then in Muffle kiln roasting to get arriving composite S APO-56/SAPO-34 molecular sieve.The present invention has synthesized the composite molecular screen of SAPO-56 and SAPO-34, and crystal morphology is different, regular crystal forms, and solid phase yield is high, lays a good foundation to the further preparation research of composite molecular screen.
Description
Technical field
The present invention relates to a kind of preparation methods of SAPO-56/SAPO-34 composite molecular screen, belong to technical field of molecular sieve.
Background technique
Low-carbon alkene is basic chemical raw materials important in modern chemical industry, and with the development of modern industry to it
Demand is increasing.Ethylene, propylene tradition to produce mode be petroleum cracking, asked it is contemplated that petroleum resources are limited etc.
Topic, it is rear to propose to replace traditional handicraft by the method for methanol producing olefinic hydrocarbons.Methanol-to-olefins（MTO）Key be catalyst
Selection, the catalyst that can be used for methanol-to-olefins have chabasie, erionite, ZK-5 molecular sieve etc., but due to the limit of pore structure
System, it is easy to which forming carbon distribution leads to catalyst inactivation.It is at present SAPO-34 molecular sieve applied to the dominant catalyst of MTO technique,
The molecular sieve analog belongs to one kind of phosphate aluminium molecular sieve, and structure is similar to chabasie, belongs to trigonal system, and orifice diameter is 0.42 ~
0.5nm.The molecular sieve has highly selective, high hydrothermal stability, the characteristics such as suitable acidity.But it is short there is also the service life,
The problems such as easy carbon distribution, it is therefore desirable to which research selectivity is good, the service life is long and lower-cost catalyst.It generally can be brilliant by reducing
Particle size changes crystal morphology to reduce inactivation and improve reaction rate.
SAPO-56 molecular sieve is a kind of novel aperture silicoaluminophosphamolecular molecular sieves, pore size and SAPO-34 molecular sieve phase
Closely, thus MTO reaction in good application prospect.It is less for SAPO-56 molecular sieve research at present, and seldom answer
For MTO technical study.Based on this, the present invention is by addition template and changes the modes such as crystallization condition, has synthesized SAPO-56
With the composite molecular screen of SAPO-34, change the crystal morphology of molecular sieve, extends the service life of catalyst, and be applied to MTO
Catalytic processes, selectivity of light olefin is higher, and for it, further research and industrial application are laid a good foundation.
Summary of the invention
The technical problem to be solved by the present invention is to overcome the deficiencies of existing technologies, one kind is provided with N, N, N, N- tetramethyl
The preparation method of base -1,6- hexamethylene diamine and triethylamine synthesis SAPO-56/SAPO-34 composite molecular screen, prepares the molecular sieve obtained
With different patterns, the service life of molecular sieve is extended, improves its reaction rate, is the further system of composite molecular screen
Standby research is laid a good foundation.
In order to solve the above technical problems, the present invention provides a kind of preparation method of SAPO-56/SAPO-34 composite molecular screen,
It is characterized in that including the following steps：
Step 1, by N, N, N, N- tetramethyl -1,6- hexamethylene diamine and triethylamine are thoroughly mixed uniformly, are added to later water-soluble
Mixed solution is obtained in liquid；
Step 2, silicon source is added in the mixed solution that step 1 obtains, and is sufficiently stirred 0.5 ~ 2 hour and is mixed at room temperature
Solution A is closed, silicon source is then added into mixed solution A, 1 hour B that gets a uniform mixture is sufficiently stirred；
Phosphoric acid is added dropwise in the mixed solution B that step 2 obtains by step 3, and stirring is until the gel being uniformly mixed
Shape mixture；
Step 4, the gelatinous mixture that step 3 is obtained are transferred to crystallization in autoclave；It is cooled to after the completion of crystallization
Room temperature is washed with deionized, dry, is calcined in Muffle furnace to get compound SAPO-56/SAPO-34 molecular sieve is arrived.
Further, in above-mentioned steps one, the molar ratio of the N, N, N, N- tetramethyl -1,6- hexamethylene diamine and triethylamine are
0.4~8。
Further, in above-mentioned steps two, silicon source is with SiO2Meter, silicon source is with Al2O3It counts, in the mixed solution B, reaction
The mol ratio of raw material is SiO2:Al2O3=0.5~2。
Further, in above-mentioned steps two, the silicon source is one of white carbon black, silica solution and ethyl orthosilicate or several
Kind.
Further, in above-mentioned steps two, source of aluminium is one of aluminium hydroxide, boehmite and aluminium isopropoxide
Or it is several.
Further, in above-mentioned steps four, the autoclave is stainless steel material, and with teflon lined.
Further, in above-mentioned steps four, the crystallization condition is：Crystallization 2 ~ 5 days at a temperature of 160 ~ 220 ° of С.
Further, in above-mentioned steps four, the calcination condition is：500 ~ 600 ° of С calcinings 4 ~ 7 are small in air atmosphere
When.
The beneficial effects obtained by the present invention are as follows：The present invention has synthesized the composite molecular screen of SAPO-56 and SAPO-34, synthesis
Composite molecular screen have different crystal morphologies, crystallinity is preferable, regular crystal forms, extends the service life of molecular sieve, mentions
Its high reaction rate, solid phase yield is high, lays a good foundation to the further preparation research of composite molecular screen.
Detailed description of the invention
Fig. 1 is the XRD spectrum for the SAPO-56/SAPO-34 composite molecular screen that the embodiment of the present invention 1 obtains；
Fig. 2 is the SEM figure for the SAPO-56/SAPO-34 composite molecular screen appearance structure that embodiment 1 obtains；
Fig. 3 is the XRD spectrum for the SAPO-56/SAPO-34 composite molecular screen that the embodiment of the present invention 2 obtains；
Fig. 4 is the SEM figure for the SAPO-56/SAPO-34 composite molecular screen appearance structure that embodiment 2 obtains；
Fig. 5 is the SEM figure for the SAPO-56/SAPO-34 composite molecular screen appearance structure that embodiment 4 obtains.
Specific embodiment
The invention will be further described below in conjunction with the accompanying drawings.Following embodiment is only used for clearly illustrating the present invention
Technical solution, and not intended to limit the protection scope of the present invention.
Embodiment 1：
One kind is with N, N, N, the system of N- tetramethyl -1,6- hexamethylene diamine and triethylamine synthesis SAPO-56/SAPO-34 composite molecular screen
Preparation Method, steps are as follows：
Step 1：By N, N, N, N- tetramethyl -1,6- hexamethylene diamine and triethylamine are thoroughly mixed and get a uniform mixture, it
After be added in aqueous solution.The molar ratio of N, N, N, N- tetramethyl -1,6- hexamethylene diamine and triethylamine is 8.
Step 2：By boehmite（Al2O3Content is 75%）It is added in above-mentioned homogeneous mixture solotion, stirs at room temperature
It mixes 1 hour, obtains mixed solution A, then weigh silica solution（SiO2Content is 40%）It is added in mixed solution A, is sufficiently stirred
Obtain mixed solution B within 1 hour.In mixed solution B, the mol ratio of silicon source and silicon source is SiO2:Al2O3=0.8。
Step 3：5.77g phosphoric acid is added dropwise in mixed solution B, is sufficiently stirred until obtaining homogeneous gel mixing
Object.
Step 4：The homogeneous gel mixture that step 3 obtains is transferred to stainless steel and with the height of teflon lined
It presses in reaction kettle, is put into baking oven, in a static condition, crystallization 84 hours under 200 ° of С is used after be cooled to room temperature after the completion of crystallization
Deionized water is washed several times, and then 12 hours dry at 100 ° of С, finally 560 ° of С temperature lower calcinations 6 are small in Muffle furnace
When, finally obtain SAPO-56/SAPO-34 composite molecular screen.
XRD spectrum prepared by embodiment 1 is as shown in Figure 1, it was demonstrated that the composite molecular screen of SAPO-56/SAPO-34 has been synthesized,
Its appearance structure SEM phenogram as shown in Figure 2.
Embodiment 2：
One kind is with N, N, N, the system of N- tetramethyl -1,6- hexamethylene diamine and triethylamine synthesis SAPO-56/SAPO-34 composite molecular screen
The basic step of Preparation Method, preparation is same as Example 1, unlike：In step 1, N, N, N, N- tetramethyl -1,6- oneself
The molar ratio of diamines and triethylamine becomes 2 from 8, has finally obtained the composite molecular screen of SAPO-56/SAPO-34, has more
SAPO-34 molecular sieve is formed, XRD characterization as shown in Figure 3 as a result, its pattern to square change, SEM phenogram as shown in Figure 4.
Embodiment 3：
One kind is with N, N, N, the system of N- tetramethyl -1,6- hexamethylene diamine and triethylamine synthesis SAPO-56/SAPO-34 composite molecular screen
The basic step of Preparation Method, preparation is same as Example 1, unlike：In step 1, N, N, N, N- tetramethyl -1,6- oneself
The molar ratio of diamines and triethylamine becomes 0.8 from 8, and finally obtaining most of is unformed shape spawn.
Embodiment 4：
One kind is with N, N, N, the system of N- tetramethyl -1,6- hexamethylene diamine and triethylamine synthesis SAPO-56/SAPO-34 composite molecular screen
The basic step of Preparation Method, preparation is same as Example 1, unlike：In step 1, N, N, N, N- tetramethyl -1,6- oneself
The molar ratio of diamines and triethylamine becomes 0.4 from 8, has finally obtained the composite molecular screen of SAPO-56/SAPO-34, and its shape
Looks change to partially circular square, SEM phenogram as shown in Figure 5.
Embodiment 5：
One kind is with N, N, N, the system of N- tetramethyl -1,6- hexamethylene diamine and triethylamine synthesis SAPO-56/SAPO-34 composite molecular screen
The basic step of Preparation Method, preparation is same as Example 1, unlike：In step 4, crystallization condition is small by 200 ° of С 84
180 ° of Shi Bianwei С 84 hours and 210 ° С 84 hours, as a result crystallinity is all compared with 200 ° of small time differences of С 84, and 180 ° of С
Exist when 84 hours crystallization with the presence of most liquid, solid phase low yield or even Solid Free product.
Embodiment 6：
One kind is with N, N, N, the system of N- tetramethyl -1,6- hexamethylene diamine and triethylamine synthesis SAPO-56/SAPO-34 composite molecular screen
The basic step of Preparation Method, preparation is same as Example 1, unlike：In step 4, crystallization condition is small by 200 ° of С 84
200 ° of Shi Bianwei С 70 hours, shortens crystallization time, and the SAPO-56/SAPO-34 molecular sieve crystallinity as a result obtained is poor.
Embodiment 7：
One kind is with N, N, N, the system of N- tetramethyl -1,6- hexamethylene diamine and triethylamine synthesis SAPO-56/SAPO-34 composite molecular screen
The basic step of Preparation Method, preparation is same as Example 1, unlike：SiO in step 2, in mixed solution B2:Al2O3
=0.8 becomes SiO2:Al2O3=0.5 and 1.2, the composite molecular screen of SAPO-56/SAPO-34 is finally obtained, but solid phase produces
It measures lower.
According to above-described embodiment 1 to 7 it is found that the molar ratio of N, N, N, N- tetramethyl -1,6- hexamethylene diamine and triethylamine is to crystalline substance
The pattern of body is affected, and with the reduction of molar ratio, has more SAPO-34 molecular sieve characteristic peaks and occurs, pattern more becomes
It is bordering on rectangular；And can crystallization temperature be successfully affected to synthesizing, and improves the synthesis that crystallization temperature is conducive to molecular sieve.Silicon
The height of aluminium ratio has a certain impact to the yield of molecular sieve, and as silica alumina ratio improves, solid phase yield is lower.
The above is only a preferred embodiment of the present invention, it is noted that for the ordinary skill people of the art
For member, without departing from the technical principles of the invention, several improvement and deformations can also be made, these improvement and deformations
Also it should be regarded as protection scope of the present invention.
Claims (8)
1. a kind of preparation method of SAPO-56/SAPO-34 composite molecular screen, characterized in that include the following steps：
Step 1, by N, N, N, N- tetramethyl -1,6- hexamethylene diamine and triethylamine are thoroughly mixed uniformly, are added to later water-soluble
Mixed solution is obtained in liquid；
Step 2, silicon source is added in the mixed solution that step 1 obtains, and is sufficiently stirred 0.5 ~ 2 hour and is mixed at room temperature
Solution A is closed, silicon source is then added into mixed solution A, 1 hour B that gets a uniform mixture is sufficiently stirred；
Phosphoric acid is added dropwise in the mixed solution B that step 2 obtains by step 3, and stirring is until the gel being uniformly mixed
Shape mixture；
Step 4, the gelatinous mixture that step 3 is obtained are transferred to crystallization in autoclave；It is cooled to after the completion of crystallization
Room temperature is washed with deionized, dry, is calcined in Muffle furnace to get compound SAPO-56/SAPO-34 molecular sieve is arrived.
2. a kind of preparation method of SAPO-56/SAPO-34 composite molecular screen according to claim 1, characterized in that on
It states in step 1, the N, N, N, the molar ratio of N- tetramethyl -1,6- hexamethylene diamine and triethylamine is 0.4 ~ 8.
3. a kind of preparation method of SAPO-56/SAPO-34 composite molecular screen according to claim 1, characterized in that on
It states in step 2, silicon source is with SiO2Meter, silicon source is with Al2O3It counts, in the mixed solution B, the mol ratio of reaction raw materials is
SiO2:Al2O3=0.5~2。
4. a kind of preparation method of SAPO-56/SAPO-34 composite molecular screen according to claim 1, characterized in that on
It states in step 2, the silicon source is one or more of white carbon black, silica solution and ethyl orthosilicate.
5. a kind of preparation method of SAPO-56/SAPO-34 composite molecular screen according to claim 1, characterized in that on
It states in step 2, source of aluminium is one or more of aluminium hydroxide, boehmite and aluminium isopropoxide.
6. a kind of preparation method of SAPO-56/SAPO-34 composite molecular screen according to claim 1, characterized in that on
It states in step 4, the autoclave is stainless steel material, and with teflon lined.
7. a kind of preparation method of SAPO-56/SAPO-34 composite molecular screen according to claim 1, characterized in that on
It states in step 4, the crystallization condition is：Crystallization 2 ~ 5 days at a temperature of 160 ~ 220 ° of С.
8. a kind of preparation method of SAPO-56/SAPO-34 composite molecular screen according to claim 1, characterized in that on
It states in step 4, the calcination condition is：500 ~ 600 ° of С are calcined 4 ~ 7 hours in air atmosphere.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110237808A (en) * | 2019-05-26 | 2019-09-17 | 天津大学 | A kind of silylating reagent method of Y molecular sieve |
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| US20040064008A1 (en) * | 2002-09-30 | 2004-04-01 | Torsten Maurer | Molecular sieve catalyst composition |
| CN101318869A (en) * | 2008-06-12 | 2008-12-10 | 中国石油化工股份有限公司 | Process for converting oxygen-containing compound to prepare low carbon olefin hydrocarbon |
| CN103058208A (en) * | 2011-10-24 | 2013-04-24 | 中国石油化工股份有限公司 | Preparation method of SAPO-56 molecular sieve |
| CN107601522A (en) * | 2017-09-22 | 2018-01-19 | 中国华能集团公司 | A kind of silicoaluminophosphamolecular molecular sieves and its synthetic method |
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2018
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| CN1354688A (en) * | 1999-06-07 | 2002-06-19 | 埃克森化学专利公司 | Protecting catalytic activity of SAPO molecular sieve |
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| US20040064008A1 (en) * | 2002-09-30 | 2004-04-01 | Torsten Maurer | Molecular sieve catalyst composition |
| CN101318869A (en) * | 2008-06-12 | 2008-12-10 | 中国石油化工股份有限公司 | Process for converting oxygen-containing compound to prepare low carbon olefin hydrocarbon |
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| CN110237808A (en) * | 2019-05-26 | 2019-09-17 | 天津大学 | A kind of silylating reagent method of Y molecular sieve |
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