CN111099609B - Synthesis method of beta molecular sieve - Google Patents
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Abstract
The invention relates to a synthesis method of a beta molecular sieve and the synthesized beta molecular sieve, which mainly solve the problem of low catalytic performance of the synthesized beta molecular sieve in the prior art. The method comprises the steps of contacting a silicon source, an aluminum source, an organic structure directing agent and water under crystallization conditions to obtain a beta molecular sieve; and optionally, a step of calcining the obtained molecular sieve; wherein, the organic structure directing agent is selected from the technical scheme of alkali or salt of 1, 1' - [ (1, 4-phenylenebis (methylene) ] bis (1-methylpiperidine-1-onium) cation, and the problem is better solved.
Description
Technical Field
The invention relates to a synthesis method of a beta molecular sieve and the synthesized beta molecular sieve.
Background
In industry, porous inorganic materials are widely used as catalysts and catalyst supports. The porous material has relatively high specific surface and smooth pore channel structure, so that the porous material is a good catalytic material or catalyst carrier. The porous material may generally comprise: amorphous porous materials, crystalline molecular sieves, modified layered materials, and the like. These subtle differences in the structure of the materials are indicative of significant differences in their own catalytic and adsorptive properties of the materials, as well as differences in the various observable properties used to characterize them, such as their morphology, specific surface area, void size, and variability in these dimensions.
The basic framework structure of crystalline microporous zeolites is based on a rigid three-dimensional TO4(SiO4, AlO4, etc.) unit structure; in this structure TO4 shares oxygen atoms in a tetrahedral fashion, the charge balance of skeletal tetrahedra such as AlO4 being maintained by the presence of surface cations such as Na +, H +. It follows that the framework properties of zeolites can be altered by means of cation exchange. Meanwhile, a rich pore system with a certain pore diameter exists in the structure of the zeolite, the pores are staggered with each other to form a three-dimensional network structure, and the framework of the pore system can still exist stably after water or organic matters in the pore system are removed (US 4439409). Based on the above structure, zeolites not only have good catalytic activity for a variety of organic reactions, excellent shape selectivity, but also can achieve good selectivity by modification (US 6162416, US 4954325, US 5362697).
The Beta molecular sieve has a framework type code of BEA, has partial disorder in the framework structure, and is a stacking fault symbiotic structure consisting of three crystal forms of A, B and C. The synthesis of Beta molecular sieves generally employs an alkali or salt of tetraethylammonium cation as an organic structure directing agent. Jiangyixen et al, crystallized for 8 days to obtain Beta molecular sieve (Shandong chemical engineering, 46 vol.5, 8-10 p.2017) using tetraethylammonium bromide as organic structure directing agent and ammonia water, sodium fluoride, sodium aluminate, sodium hydroxide and water as inorganic raw materials. Wangyongrui et al, which uses roasted H-type Beta molecular sieve as raw material, dealuminates by acid treatment, then mixes with template agent and silicon source solution and crystallizes to obtain Beta molecular sieve (CN 102050463B) containing 3-5 nanometer mesopores, which shows higher activity in 1,3, 5-triisopropylbenzene reaction than conventional Beta molecular sieve. Li Yingxia et al synthesized a hierarchical pore Beta molecular sieve (CN 102826565B) in one step using a "pseudo-solid" aluminosilicate.
Disclosure of Invention
One of the technical problems to be solved by the invention is the problem that the synthesized beta molecular sieve in the prior art is not high in catalytic performance. Provides a new synthesis method of a beta molecular sieve. The second technical problem to be solved by the present invention is to provide a new beta molecular sieve.
In order to solve one of the above technical problems, the technical scheme adopted by the invention is as follows:
a method for synthesizing a beta molecular sieve comprises the steps of contacting a silicon source, an aluminum source, an organic structure directing agent and water under crystallization conditions to obtain the molecular sieve; and optionally, a step of calcining the obtained molecular sieve; wherein the organic structure directing agent is selected from a compound of the following structural formula (I), a quaternary ammonium salt thereof or a quaternary ammonium base form thereof,
wherein, R is1Is alkyl, R2Is an alkyl group.
In the above technical scheme, R1Is C1-6Alkyl, preferably C1-3An alkyl group; r2Is C1-6Alkyl is preferably C1-3An alkyl group. Such as methyl, ethyl, propyl.
In the above technical scheme, the structure directing agent is in the form of quaternary ammonium base containing a structural formula (I).
In the above technical scheme, the structure directing agent is a base of 1, 1' - [ (1, 4-phenylenebis (methylene) ] bis (1-methylpiperidin-1-ium) cation.
In the above technical solution, preferably, the organic structure directing agent is in the form of quaternary ammonium base of structural formula (II), the structural formula is as follows:
in the above technical solution, the molar ratio of the silicon source, the aluminum source, the organic structure directing agent and water is 1: (0.005-0.1): (0.03-1.0): (3-40), preferably 1: (0.01 to 1/15): (0.1-1.0): (5-30), more preferably 1: (0.01-0.05): (0.15-0.8): (8-25), more preferably 1: (0.02-0.05): (0.15-0.7): (8-20), more preferably 1: (0.025-0.05): (0.2-0.6): (15-20).
In the above technical solution, the synthesis method comprises a step of contacting a silicon source, an aluminum source, an organic structure directing agent and water under crystallization conditions to obtain the molecular sieve.
In the above technical solution, the synthesis method includes a step of contacting a silicon source, an aluminum source, an organic structure directing agent, a fluorine source, and water under crystallization conditions to obtain the molecular sieve, wherein a ratio F/OSDA of the fluorine source to the organic structure directing agent is 0.5 to 3, preferably 0.5 to 2, and more preferably 1 to 2.
In the above technical solution, the crystallization conditions include: the crystallization temperature is 100-200 ℃, and preferably 130-180 ℃; more preferably 150 to 170 ℃; the crystallization time is 1-20 days, preferably 2-15 days, more preferably 2-10 days, and more preferably 2-6 days.
In the above technical solution, the silicon source includes at least one selected from silicic acid, silica gel, silica sol, tetraalkyl silicate, sodium silicate, water glass, and white carbon black, preferably at least one selected from silica sol, tetraalkyl silicate, and white carbon black, and more preferably at least one selected from silica sol and tetraethyl silicate; the aluminum source comprises aluminum oxide, aluminum nitrate, aluminum isopropoxide, aluminum hydroxide and sodium aluminate; the fluorine source comprises at least one selected from hydrofluoric acid, ammonium fluoride and sodium fluoride, preferably hydrofluoric acid.
In the above technical scheme, the heating mode is a direct heating mode, or a microwave heating mode, or a composite mode of direct heating and microwave heating.
In the above technical solution, the method further comprises a step of roasting to obtain the beta molecular sieve, wherein the roasting conditions include: the roasting temperature is 300-800 ℃, and preferably 400-650 ℃; the roasting time is 1-10 hours, preferably 3-6 hours; the roasting atmosphere is air or oxygen.
The invention also provides the beta molecular sieve synthesized according to the synthesis method of the beta molecular sieve.
In the above technical solution, the size of the beta molecular sieve crystal is less than 100 nm, preferably less than 60 nm, and preferably less than 40 nm.
According to the beta molecular sieve synthesized by the synthesis method of the beta molecular sieve, the content of impurities in a molecular sieve product is not higher than 35 wt%, preferably not higher than 30 wt%, more preferably not higher than 25 wt%, more preferably not higher than 20 wt%, more preferably not higher than 15 wt%, more preferably not higher than 10 wt%, and more preferably not higher than 5 wt%.
According to the beta molecular sieve synthesized by the synthesis method of the beta molecular sieve, the existence form of impurities in a molecular sieve product comprises at least one of physical mixing and co-crystallization. Wherein, the physical mixing means that no chemical interaction exists between beta molecular sieve crystals and impurities; the co-crystallization refers to the crystal of a beta molecular sieve product, which simultaneously contains a unit cell of the beta molecular sieve and a unit cell of impurities. The impurities in the molecular sieve product are selected from amorphous SiO2At least one of molecular sieves other than beta, metal oxides, quartz, tridymite, and cristobalite; preferably amorphous SiO2At least one of ZSM-5 molecular sieve, MOR and FER type molecular sieve; more preferably amorphous SiO2。
The invention also provides a beta molecular sieve composition which comprises the beta molecular sieve synthesized according to the synthesis method of the beta molecular sieve and a binder.
The invention also provides the beta molecular sieve synthesized by the synthesis method of the beta molecular sieve or the application of the beta molecular sieve composition as an adsorbent or a catalyst for organic compound conversion.
The beta molecular sieve composition, when used as an adsorbent, is used to separate at least one component from a mixture of components in either the gas or liquid phase. Thus, at least one component may be partially or substantially completely separated from the mixture of components by contacting the mixture with the molecular sieve to selectively adsorb that component.
The method adopts the cation containing quaternary ammonium base with the structural formula (I), particularly the base of 1, 1' - [ (1, 4-phenylene bis (methylene) ] bis (1-methylpiperidine-1-onium) cation as an organic structure directing agent, and directly synthesizes the high-performance beta molecular sieve product.
Drawings
Fig. 1 is an XRD pattern of the synthesized beta molecular sieve [ example 1 ].
Fig. 2 is an XRD spectrum of the synthesized beta molecular sieve [ comparative example 1 ].
FIG. 3 shows preparation of the resulting structure directing agent bromine salt1H nuclear magnetic spectrum.
The XRD spectrum of the synthesized beta molecular sieve in example 1 is consistent with the characteristic diffraction peak of the synthesized beta molecular sieve in comparative example 1, which indicates that the obtained sample is the beta molecular sieve. The invention is further illustrated by the following examples.
Detailed Description
In the context of this specification, the method of measuring the beta molecular sieve crystalline phase content of a molecular sieve product, including the following examples and comparative examples, is: analyzing the phase of the sample by using a Nippon Rigaku Ultima type IV X-ray powder diffractometer, a CuK alpha ray source
The 2 theta scanning range of the nickel filter is 2-50 degrees, the operating voltage is 35KV, the current is 25mA, and the scanning speed is 10 degrees/min.
Unless otherwise explicitly indicated, all percentages, parts, ratios, etc. referred to in this specification are by weight unless not otherwise generally recognized by those of skill in the art.
The synthetic route for the base of the structure directing agent 1, 1' - [ (1, 4-phenylenebis (methylene) ] bis (1-methylpiperidin-1-ium) cation is:
the method comprises the following steps: first, 42.24 g of 1, 4-p-dibromide benzyl and N-methylpyrrolidine are mixed as 1, 4-p-dibromide benzyl: n-methylpiperidine was added to a three-necked flask containing 200ml of ethanol at a molar ratio of 1:3, and the mixture was stirred at 50 ℃ for 24 hours. And (3) after 24 hours of reaction, carrying out vacuum filtration on the solution, washing the white solid by using ethyl acetate and diethyl ether, carrying out vacuum-pumping drying by using an oil pump to obtain white quaternary ammonium salt solid powder with the yield of 98.2%, and confirming the product by adopting conventional liquid nuclear magnetic resonance. The concrete conditions are as follows: 500 Megahertz (MHZ) liquid nmr with deuterated dimethyl sulfoxide (DMSO) as solvent.
Mixing quaternary ammonium salt with silver oxide (Ag)2O) to obtain quaternary ammonium base, wherein the specific method comprises the following steps: at normal temperature, using quaternary ammonium salt: ag2Dissolving quaternary ammonium salt and silver oxide in a molar ratio of 1:1.5 in a three-neck flask containing a certain amount of distilled water (the mass ratio of the distilled water to the quaternary ammonium salt is 2-3), and stirring for reaction for 5 hours. The solution was filtered under reduced pressure to remove solid residue, and the resulting clear solution was left to stand for 1 day and filtered again. The concentration of the quaternary ammonium base solution was determined by acid base titration of the exchanged solution. The method for determining whether the reaction is completely performed is as follows: and (3) taking a small amount of solution, titrating with silver nitrate solution, and if light yellow precipitate is generated, indicating that the exchange is not complete, adding silver oxide to continue the reaction until the silver oxide reacts with the silver nitrate to generate no precipitate.
[ example 1 ]
13.33 g of organic structure directing agent 1, 1' - [ (1, 4-phenylenebis (methylene)]Base of bis (1-methylpiperidin-1-ium) cation (19.0% by weight), 3.75g of silica Sol (SiO)240.0% by weight), 0.26g of aluminum hydroxide, 0.75g of HF solution (40.0% by weight) were mixed homogeneously, after which 9.00g of water were removed by evaporation from the mixture in a water bath at 80 ℃ to give a reaction mixture of the following materials in the proportions (molar ratios):
SiO2/Al2O3＝15
OSDA/SiO2＝0.3
HF/SiO2＝0.6
H2O/SiO2＝10
after being mixed evenly, the mixture is put into a stainless steel reaction kettle and crystallized for 5 days at 150 ℃ under the condition of stirring. And after crystallization, filtering, washing, drying and roasting to obtain the beta molecular sieve. The drying temperature was 100 ℃ for 12 hours. The calcination temperature was 550 ℃ and the atmosphere was air for 6 hours. The XRD spectrum of the molecular sieve product is shown in figure 1.
[ example 2 ]
13.33 g of organic structureTo the agent 1, 1' - [ (1, 4-phenylenebis (methylene)]Base of bis (1-methylpiperidin-1-ium) cation (19.0% by weight), 3.75g of silica Sol (SiO)240.0% by weight), 0.13g of aluminium hydroxide, 0.75g of HF solution (40.0% by weight) were mixed homogeneously, after which 9.0g of water were removed by evaporation from the mixture in a water bath at 80 ℃ to give a reaction mixture of the following composition (molar ratios):
SiO2/Al2O3＝30
OSDA/SiO2＝0.3
HF/SiO2＝0.6
H2O/SiO2＝10
after being mixed evenly, the mixture is put into a stainless steel reaction kettle and crystallized for 5 days at 160 ℃ under the condition of stirring. And after crystallization, filtering, washing and drying to obtain the synthesized beta molecular sieve. The XRD pattern is similar to that of FIG. 1.
[ example 3 ]
13.33 g of the organic structure directing agent 1, 1' - [ (1, 4-phenylenebis (methylene)]Base of bis (1-methylpiperidin-1-ium) cation (19.0% by weight), 3.75g of silica Sol (SiO)240.0% by weight), 0.10g of aluminium hydroxide, 0.75g of HF solution (40.0% by weight) were mixed homogeneously, after which 9.00g of water were removed by evaporation from the mixture in a water bath at 80 ℃ to give a reaction mixture of the following composition (molar ratios):
SiO2/Al2O3＝40
OSDA/SiO2＝0.3
HF/SiO2＝0.6
H2O/SiO2＝10
after being mixed evenly, the mixture is put into a stainless steel reaction kettle and crystallized for 6 days at 150 ℃ under the condition of stirring. And after crystallization, filtering, washing and drying to obtain the synthesized beta molecular sieve. The XRD pattern is similar to that of FIG. 1.
[ example 4 ]
13.33 g of organic structure directing agent 1, 1' - [ (1, 4-phenylenebis (methylene)]Base of bis (1-methylpiperidin-1-ium) cation (19.0% by weight), 3.75g of silica Sol (SiO)240.0% by weight), 0.08g of aluminium hydroxide, 0.75g of HF solution (40.0% by weight) were mixed homogeneously, after which 9.00g of water were removed by evaporation from the mixture in a water bath at 80 ℃ to give a reaction mixture of the following composition (molar ratios):
SiO2/Al2O3＝50
OSDA/SiO2＝0.3
HF/SiO2＝0.6
H2O/SiO2＝10
after being mixed evenly, the mixture is put into a stainless steel reaction kettle and crystallized for 8 days at 150 ℃ under the condition of stirring. And after crystallization, filtering, washing and drying to obtain the synthesized beta molecular sieve. The XRD pattern is similar to that of FIG. 1.
[ example 5 ]
13.33 g of organic structure directing agent 1, 1' - [ (1, 4-phenylenebis (methylene)]Base of bis (1-methylpiperidin-1-ium) cation (19.0% by weight), 3.75g of silica Sol (SiO)240.0% by weight), 0.20g of aluminium hydroxide, 0.75g of HF solution (40.0% by weight) were mixed homogeneously, after which 9.00g of water were removed by evaporation from the mixture in a water bath at 80 ℃ to give a reaction mixture of the following composition (molar ratios):
SiO2/Al2O3＝20
OSDA/SiO2＝0.3
HF/SiO2＝0.6
H2O/SiO2＝10
after being mixed evenly, the mixture is put into a stainless steel reaction kettle and crystallized for 6 days at 150 ℃ under the condition of stirring. And after crystallization, filtering, washing and drying to obtain the synthesized beta molecular sieve. The XRD pattern is similar to that of FIG. 1.
[ example 6 ] A method for producing a polycarbonate
26.66 g of organic structure directing agent 1, 1' - [ (1, 4-phenylenebis (methylene)]Base of bis (1-methylpiperidin-1-ium) cation (19.0% by weight), 3.75g of silica Sol (SiO)240.0% by weight), 0.20g of aluminum hydroxide, 1.50g of HF solution (40.0% by weight) were mixed homogeneously, after which the mixture was passed through a water bath at 80 ℃Evaporation of 20.25g of water gave a reaction mixture of the following composition (molar ratio):
SiO2/Al2O3＝20
OSDA/SiO2＝0.6
HF/SiO2＝1.2
H2O/SiO2＝10
after being mixed evenly, the mixture is put into a stainless steel reaction kettle and crystallized for 6 days at 140 ℃ under the condition of stirring. And after crystallization, filtering, washing and drying to obtain the synthesized beta molecular sieve. The XRD pattern is similar to that of FIG. 1.
[ example 7 ]
13.33 g of organic structure directing agent 1, 1' - [ (1, 4-phenylenebis (methylene)]Base of bis (1-methylpiperidin-1-ium) cation (19.0% by weight), 3.75g of silica Sol (SiO)240.0% by weight), 0.16g of aluminum isopropoxide, 0.75g of HF solution (40.0% by weight) were mixed homogeneously, after which 9.00g of water were removed by evaporation from the mixture in a water bath at 80 ℃ to give a reaction mixture of the following materials in the proportions (molar ratios):
SiO2/Al2O3＝20
OSDA/SiO2＝0.3
HF/SiO2＝0.6
H2O/SiO2＝10
after being mixed evenly, the mixture is put into a stainless steel reaction kettle and crystallized for 8 days at 140 ℃ under the condition of stirring. And after crystallization, filtering, washing and drying to obtain the synthesized beta molecular sieve. The XRD pattern is similar to that of FIG. 1.
[ example 8 ]
13.33 g of organic structure directing agent 1, 1' - [ (1, 4-phenylenebis (methylene)]Base of bis (1-methylpiperidin-1-ium) cation (19.0% by weight), 3.75g of silica Sol (SiO)240.0% by weight), 0.10g of aluminum isopropoxide, 0.75g of HF solution (40.0% by weight) were mixed homogeneously, after which 9.00g of water were removed by evaporation from the mixture in a water bath at 80 ℃ to give a reaction mixture of the following materials in the proportions (molar ratios):
SiO2/Al2O3＝30
OSDA/SiO2＝0.3
HF/SiO2＝0.6
H2O/SiO2＝10
after being mixed evenly, the mixture is put into a stainless steel reaction kettle and crystallized for 10 days at 140 ℃ under the condition of stirring. And after crystallization, filtering, washing and drying to obtain the synthesized beta molecular sieve. The XRD pattern is similar to that of FIG. 1.
[ example 9 ]
13.33 g of organic structure directing agent 1, 1' - [ (1, 4-phenylenebis (methylene)]Base of bis (1-methylpiperidin-1-ium) cation (19.0% by weight), 3.75g of silica Sol (SiO)240.0% by weight), 0.26g of aluminum hydroxide, and then 9.00g of water was removed by evaporation from the mixture in a water bath at 80 ℃ to obtain a reaction mixture having the following material ratios (molar ratios):
SiO2/Al2O3＝15
OSDA/SiO2＝0.3
H2O/SiO2＝10
after being mixed evenly, the mixture is put into a stainless steel reaction kettle and crystallized for 5 days at 150 ℃ under the condition of stirring. And after crystallization, filtering, washing, drying and roasting to obtain the beta molecular sieve. The drying temperature was 100 ℃ for 12 hours. The calcination temperature was 550 ℃ and the atmosphere was air for 6 hours. The XRD spectrum of the molecular sieve product is shown in figure 1.
[ example 10 ]
The catalytic performance of the beta molecular sieve obtained in example 1 was evaluated by the alkylation of benzene with 1-dodecene. The evaluation apparatus was a mini high pressure reactor having a volume of 100 mL. The reaction conditions are as follows: the mass ratio of the benzene to the catalyst is 15, the mol ratio of the benzene to the 1-dodecene is 11, the stirring speed is 600 r/min, the temperature is 140 ℃, and the reaction is carried out for 3 hours under the autogenous pressure. The reaction filtrate was analyzed by Agilent gas chromatography analyzer model HP7890series GC. The conversion of 1-dodecene was 95.8%. [ COMPARATIVE EXAMPLE 1 ]
Synthesized according to the reference CN201410027260.8Beta molecular sieve, (1) treating Beta molecular sieve seeds with ammonium fluoride: 20ml of 10 wt% ammonium fluoride solution was prepared, 5g of Beta molecular sieve seed crystal was added, and the mixture was heated in a water bath at 70 ℃ and stirred for 4 hours to obtain suspension A. (2) 12g of TEAOH solution (technical grade, TEAOH is more than or equal to 25 wt%) and 1.5g of NaAlO are taken2Solid (chemical purity, Al)2O349 wt%) was stirred to prepare a solution, and 50g of silica sol (technical grade, SiO) was added under stirring2Not less than 30wt percent) and uniformly mixing to form the silicon-aluminum gel, wherein the feeding molar ratio of the materials is as follows: SiO 22/Al2O3＝35，TEA+/SiO2＝0.08，H2O/SiO 210. To the silica-alumina gel was added 3g of the homogenized suspension a, the suspension a/silica-alumina gel being 4.7 wt%. Stirring for 30 min, putting into a stainless steel reaction kettle, sealing, and crystallizing at 150 deg.C for 18 hr to obtain milky suspension B. (3) And (4) drying the suspension B for 6 hours at 110 ℃ after suction filtration and washing, and roasting for 3 hours at 500 ℃ to obtain a white powder product. The XRD spectrum is shown in figure 2.
[ COMPARATIVE EXAMPLE 2 ]
The catalytic performance of the beta molecular sieve obtained in comparative example 1 was evaluated by the alkylation reaction of benzene with 1-dodecene. Before evaluation, beta molecular sieve was converted to form H by exchange. The evaluation apparatus was a mini high pressure reactor having a volume of 100 mL. The reaction conditions are as follows: the mass ratio of the benzene to the catalyst is 15, the mol ratio of the benzene to the 1-dodecene is 11, the stirring speed is 600 r/min, the temperature is 140 ℃, and the reaction is carried out for 3 hours under the autogenous pressure. The reaction filtrate was analyzed by Agilent gas chromatography analyzer model HP7890series GC. The conversion of 1-dodecene was 38.0%.
Claims (10)
1. A method for synthesizing a beta molecular sieve comprises the steps of contacting a silicon source, an aluminum source, an organic structure directing agent and water under crystallization conditions to obtain the molecular sieve; and optionally, a step of calcining the obtained molecular sieve; wherein the organic structure directing agent is selected from a compound of the following structural formula (I), a quaternary ammonium salt thereof or a quaternary ammonium base form thereof,
wherein, R is1Is alkyl, R2Is an alkyl group.
2. The method of synthesizing beta molecular sieve of claim 1, wherein R is1Is C1-6Alkyl radical, R2Is C1-6An alkyl group.
3. The method for synthesizing beta molecular sieve according to claim 1, wherein the organic structure directing agent is base of 1, 1' - [1, 4-phenylenebis (methylene) ] bis (1-methylpiperidin-1-ium) cation.
4. The method for synthesizing the beta molecular sieve according to claim 1, wherein the molar ratio of the silicon source, the aluminum source, the organic structure directing agent and water is 1: (0.005-0.1): (0.03-1.0): (3-40).
5. The method for synthesizing beta molecular sieve according to claim 1, wherein the method comprises the step of contacting a silicon source, an aluminum source, an organic structure directing agent, a fluorine source and water under crystallization conditions to obtain the molecular sieve, wherein the ratio F/OSDA of the fluorine source to the organic structure directing agent is 0.5-3.
6. The method for synthesizing beta molecular sieve according to claim 1, wherein the crystallization conditions comprise: the crystallization temperature is 100-200 ℃, and the crystallization time is 1-20 days.
7. The method for synthesizing the beta molecular sieve according to claim 1, wherein the silicon source comprises at least one selected from silicic acid, silica gel, silica sol, tetraalkyl silicate, sodium silicate, water glass and white carbon black; the aluminum source comprises at least one selected from aluminum oxide, aluminum nitrate, aluminum isopropoxide, aluminum hydroxide and sodium aluminate.
8. The beta molecular sieve synthesized by the method for synthesizing the beta molecular sieve in any one of claims 1-7, wherein the crystal size of the beta molecular sieve is less than 100 nanometers.
9. A beta molecular sieve composition comprising a beta molecular sieve synthesized according to the beta molecular sieve synthesis method of any one of claims 1-7, and a binder.
10. Use of the beta molecular sieve synthesized by the synthesis method of any one of claims 1-7 or the beta molecular sieve composition of claim 9 as an adsorbent or catalyst for organic compound conversion.
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| CN102826565A (en) * | 2012-09-05 | 2012-12-19 | 北京化工大学 | Preparation method of multi-stage pore channel beta molecular screen |
| CN106512848A (en) * | 2016-09-30 | 2017-03-22 | 武汉工程大学 | Cyclic quaternary ammonium salt gemini surfactant and preparation method thereof |
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| CN102826565A (en) * | 2012-09-05 | 2012-12-19 | 北京化工大学 | Preparation method of multi-stage pore channel beta molecular screen |
| CN107511172A (en) * | 2016-06-18 | 2017-12-26 | 中国石油化工股份有限公司 | Beta molecular sieve catalysts, preparation method and application |
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