Beta/ZSM-12 intergrowth zeolite molecular sieve and preparation method thereof

A technology of symbiotic molecular sieves and seed crystals, which is applied in the direction of ZSM-12 crystalline aluminum silicate zeolite, molecular sieve catalysts, molecular sieves and alkali exchange compounds, can solve the problems of high cost, single shape of symbiotic molecular sieves, complex preparation, etc., and achieve Reduced emissions, simple process, and broad application prospects

Active Publication Date: 2018-07-13
CHINA UNIV OF PETROLEUM (BEIJING)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0010] The purpose of the present invention is to provide a new Beta / ZSM-12 symbiotic molecular sieve and its preparation method. The preparation process is simple, and the raw material price is cheap. The synthetic symbiotic molecular sieve has the topological structure of MTW and BEA, and has a multi-level pore structure. Combining the characteristics of Beta molecular sieve and ZSM-12 molecular sieve, it solves the problems of single shape, complex preparation and high cost of the symbiotic molecular sieve synthesized by the current technology

Method used

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  • Beta/ZSM-12 intergrowth zeolite molecular sieve and preparation method thereof
  • Beta/ZSM-12 intergrowth zeolite molecular sieve and preparation method thereof
  • Beta/ZSM-12 intergrowth zeolite molecular sieve and preparation method thereof

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Experimental program
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Effect test

Embodiment 1

[0043] (1) Raw material configuration: Take 5.2g of tetraethylammonium bromide (0.025mol, equivalent to 0.3 times of coarse-pore silica gel) and add it to 28.71g of water (1.595mol, equivalent to 20 times of coarse-pore silica gel), and add to the solution 3.37g of ammonia water (0.0525mol, equivalent to 0.64 times of coarse-pore silica gel) was added dropwise, followed by 0.61g of sodium hydroxide (0.015mol, equivalent to 0.18 times of coarse-pore silica gel) and 0.42g of potassium hydroxide (0.0063mol, Equivalent to 0.077 times of coarse-porous silica gel), stir for 5-10min to dissolve and add 0.31g pseudo-boehmite (0.002mol Al 2 o 3 , equivalent to 0.025 times of coarse-pore silica gel), continue to stir for 10-80min until the solution is clear, slowly add coarse-pore silica gel 5g (0.082mol) and stir at a constant speed for 3h.

[0044] Introduction of seed crystals: the seed crystals are Beta zeolite with a silicon-aluminum ratio of 140, the amount of which is 0.5 g, whi...

Embodiment 2

[0051] (1) Raw material configuration: Take 5.2g of tetraethylammonium bromide (0.025mol, equivalent to 0.3 times of coarse-pore silica gel) and add it to 28.75g of water (1.597mol, equivalent to 20 times of coarse-pore silica gel), and add to the solution 3.15g of ammonia water (0.049mol, equivalent to 0.60 times of coarse-pore silica gel) was added dropwise, followed by 0.48g of sodium hydroxide (0.011mol, equivalent to 0.13 times of coarse-pore silica gel), and 0.33g of sodium bromide (0.003mol , equivalent to 0.037 times of coarse-pore silica gel) to adjust the sodium ion content and 1.13g potassium hydroxide (0.017mol, equivalent to 0.21 times of coarse-pore silica gel), stirring for 5-10min to dissolve and then adding 0.31g of pseudo-boehmite ( 0.002mol Al 2 o 3 , equivalent to 0.025 times of coarse-pore silica gel), continue to stir for 10-80min until the solution is clear, slowly add coarse-pore silica gel 5g (0.082mol) and stir at a constant speed for 3h.

[0052] I...

Embodiment 3

[0057] (1) Raw material configuration: Take 5.2g of tetraethylammonium bromide (0.025mol, equivalent to 0.3 times of coarse-pore silica gel) and add it to 28.77g of water (1.598mol, equivalent to 20 times of coarse-pore silica gel), and then add 0.75g sodium hydroxide (0.018mol, equivalent to 0.22 times of coarse-pored silica gel) and 0.51g potassium hydroxide (0.0077mol, equivalent to 0.094 times of coarse-pored silica gel), and 3.07g of ammonia water (0.048mol, equivalent to 0.094 times of coarse-pored silica gel) was added dropwise to the solution. Equivalent to 0.59 times that of coarse-porous silica gel), stir for 5-80min to dissolve and add 0.31g pseudo-boehmite (0.002mol Al 2 o 3 , equivalent to 0.025 times that of coarse-pore silica gel), continue to stir for 10-50min until the solution is clear, slowly add coarse-pore silica gel 5g (0.082mol) and stir at a constant speed for 3h.

[0058] Introduction of seed crystals: the seed crystals are Beta zeolite with a silicon...

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Abstract

The invention relates to a Beta / ZSM-12 intergrowth zeolite molecular sieve and a preparation method thereof. The intergrowth zeolite molecular sieve has a topological structure with MTW and a topological structure with BEA, wherein the particle size of the topological structure with the BEA is about 300nm; the particle size of the topological structure with the MTW is 3 to 4mu m; the silica-alumina ratio of the intergrowth zeolite molecular sieve is 10 to 80. The problems of single morphology dimension, complex preparation and higher cost of the intergrowth zeolite molecular sieve synthesizedin the prior art are mainly solved. The composite molecular sieve material can be used for the fields of catalysis, adsorptive separation and the like.

Description

technical field [0001] The invention relates to a Beta / ZSM-12 symbiotic zeolite molecular sieve and a preparation method thereof. Background technique [0002] Zeolite molecular sieve has uniform and regular pore structure, good stability, and adjustable acidity, and has been widely used in chemical industry, environmental protection and other fields. Each zeolite molecular sieve has its unique advantages. Composite molecular sieve is a composite crystal with multiple molecular sieve structures at the same time. It can combine the advantages of various molecular sieves, has better stability and acid distribution, and overcomes the disadvantages of ordinary molecular sieves. Limitations, to better meet the needs of industry, has broad application prospects. [0003] CN104591217A discloses a Beta / ZSM-12 composite molecular sieve and its synthesis method. The method is to mix alkali source, silicon source, aluminum source, water and templating agent according to a certain prop...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B39/42B01J29/80B01J32/00C10G45/12
CPCB01J29/80C01B39/023C01P2002/72C01P2004/03C01P2004/61C10G45/12C10G2400/02
Inventor 吴志杰徐可张城纲潘涛曹鹏窦涛
Owner CHINA UNIV OF PETROLEUM (BEIJING)
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