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A kind of synthesis method of mesoporous composite molecular sieve catalyst

A technology of composite molecular sieve and synthesis method, which is applied in the field of synthesis of mesoporous composite molecular sieve catalysts, can solve problems such as complex process and high synthesis cost, achieve good catalytic activity, improve hydrothermal stability and mechanical stability, reduce The effect of production costs

Inactive Publication Date: 2019-09-17
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to overcome the disadvantages of high synthesis cost and complicated process in the prior art, and provide a method for synthesizing mesoporous composite molecular sieve catalyst with simple preparation process and low price

Method used

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  • A kind of synthesis method of mesoporous composite molecular sieve catalyst
  • A kind of synthesis method of mesoporous composite molecular sieve catalyst
  • A kind of synthesis method of mesoporous composite molecular sieve catalyst

Examples

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Effect test

Embodiment 1

[0018] A method for synthesizing a mesoporous composite molecular sieve catalyst, comprising the steps of: using a template agent [C 22 h 45 -N + (CH 3 ) 2 -C 6 h 12 -N(CH 3 ) 2 ]Br - Put it into water, heat up to 60°C, dissolve, add tetraethyl orthosilicate, sodium hydroxide and aluminum sulfate, cool down to room temperature, stir for 2 hours, get the aged gel liquid, transfer to stainless steel hydrothermal synthesis reactor sealed, crystallized at 130°C for 11 days, centrifuged, washed with water, dried, and calcined at 550°C for 6 hours to obtain a mesoporous composite molecular sieve catalyst;

[0019] The templating agent [C 22 h 45 -N + (CH 3 ) 2 -C 6 h 12 -N(CH 3 ) 2 ]Br - , tetraethyl orthosilicate, sodium hydroxide and the mol ratio of aluminum sulfate are 6:60:25:2, and described templating agent [C 22 h 45 -N + (CH 3 ) 2 -C 6 h 12 -N(CH 3 ) 2 ]Br - The mass ratio with water is 1:200; see figure 1 , figure 2 , image 3 , Figure 4 ....

Embodiment 2

[0022] A method for synthesizing a mesoporous composite molecular sieve catalyst, comprising the steps of: using a template agent [C 22 h 45 -N + (CH 3 ) 2 -C 6 h 12 -N(CH 3 ) 2 ]Br - Put it into water, heat up to 50°C, dissolve, add sodium silicate, potassium hydroxide and sodium aluminate, cool down to room temperature, stir for 3 hours to obtain the aged gel liquid, transfer it to a stainless steel hydrothermal synthesis reaction kettle and seal it , crystallized at 100°C for 14 days, centrifuged, washed the solid with water, dried, and calcined at 550°C for 6 hours to obtain a mesoporous composite molecular sieve catalyst;

[0023] The templating agent [C 22 h 45 -N + (CH 3 ) 2 -C 6 h 12 -N(CH 3 ) 2 ]Br - , sodium silicate, potassium hydroxide and sodium aluminate in a mol ratio of 6:50:10:0.1, the [C 22 h 45 -N + (CH 3 ) 2 -C 6 h 12 -N(CH 3 ) 2 ]Br - The mass ratio with water is 1:160.

[0024] It is used for the aldehyde-ketone condensation r...

Embodiment 3

[0026] A method for synthesizing a mesoporous composite molecular sieve catalyst, comprising the steps of: using a template agent [C 22 h 45 -N + (CH 3 ) 2 -C 6 h 12 -N(CH 3 ) 2 ]Br - Put it into water, heat up to 70°C, dissolve, add water glass, ammonium hydroxide and tert-butylaluminum, cool down to room temperature, stir for 1 hour to obtain the aged gel liquid, transfer it to a stainless steel hydrothermal synthesis reaction kettle and seal it , crystallized at 160°C for 8 days, centrifuged, washed the solid with water, dried, and calcined at 550°C for 6 hours to obtain a mesoporous composite molecular sieve catalyst;

[0027] The templating agent [C 22 h 45 -N + (CH 3 ) 2 -C 6 h 12 -N(CH3 ) 2 ]Br - , water glass, ammonium hydroxide and tert-butyl aluminum are in a mol ratio of 6:70:40:3, and the template [C 22 h 45 -N + (CH 3 ) 2 -C 6 h 12 -N(CH 3 ) 2 ]Br - The mass ratio with water is 1:230.

[0028] It is used for the aldehyde-ketone condensa...

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Abstract

The invention discloses a method for synthesizing a mesoporous composite molecular sieve catalyst. The steps are: adding a template agent [C 22 H 45 ‑N + (CH 3 ) 2 ‑C 6 H 12 ‑N(CH 3 ) 2 ]Br ‑ , put it into water, heat it up, dissolve it, add silicon source, alkali and aluminum source, bring it down to room temperature, stir, get the aged gel liquid, transfer it to a stainless steel hydrothermal synthesis reaction kettle, seal it, crystallize it, centrifuge it, wash it, It is obtained by drying and calcining; the invention has low cost, simple process and is suitable for industrial production. The prepared catalyst has a high degree of mesoporous ordering, fully combines the high hydrothermal stability of microporous molecular sieves, improves mechanical stability, and can combine the acidic advantages of microporous zeolite molecular sieves to have good catalytic activity and is suitable for In the field of petrochemical industry and fine chemicals. This material has a hierarchical pore structure, with both MFI micropores and MCM-41 mesopore structures, and can be used in adsorption and separation and other fields.

Description

technical field [0001] The invention belongs to the field of porous materials and catalysis, in particular to a synthesis method of a mesoporous composite molecular sieve catalyst. Background technique [0002] Porous materials have received extensive attention due to their specific pore structure, large specific surface area, and good hydrothermal stability. At present, porous molecular sieve catalytic materials are divided into two types according to their pore size, mesoporous (2-50nm) molecular sieve catalytic materials and microporous (<2nm). The microporous molecular sieve catalyst has specific acid sites and strong acid properties, and its crystallized skeleton has strong hydrothermal stability, and its unique pore structure and cage structure can provide specific Pores for dispersion, adsorption, and catalysis. However, the pore size of microporous molecular sieves is small, which limits the diffusion of macromolecules, and its narrow channels prevent macromolec...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J29/70B01J35/10C07D311/32C07C45/45C07C49/835
CPCC07C45/45C07D311/32B01J29/70B01J35/64C07C49/835
Inventor 郭翔海张景双于川
Owner TIANJIN UNIV