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Synthetic method of mesoporous and micropore 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 the problems of expensive synthesis cost and complicated process, and achieve improved hydrothermal stability and mechanical stability, good catalytic activity, and reduced The effect of production costs

Inactive Publication Date: 2017-12-22
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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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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  • Synthetic method of mesoporous and micropore composite molecular sieve catalyst
  • Synthetic method of mesoporous and micropore composite molecular sieve catalyst
  • Synthetic method of mesoporous and micropore composite molecular sieve catalyst

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Experimental program
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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 synthetic method of a mesoporous and micropore composite molecular sieve catalyst. The synthetic method comprises the following steps of putting a template agent [C22H45-N<+>(CH3)2-C6H12-N(CH3)2]Br<-> in water, raising the temperature, performing dissolution, adding a silicon source, alkali and an aluminum source, reducing the temperature to room temperature, and performing stirring so as to obtain aged gel coagulation fluid; and transferring the aged gel coagulation fluid into a stainless steel hydrothermal synthesis reaction kettle, performing sealing, performing crystallization, performing centrifuging, performing washing, performing drying, and performing calcination so as to obtain the mesoporous and micropore composite molecular sieve catalyst. The synthetic method disclosed by the invention is low in cost, simple in technological process and suitable for industrialzed production. The prepared catalyst has high mesoporous orderliness, high hydrothermal stability of a micropore molecular sieve is sufficiently combined, the mechanical stability is improved, besides, the acidic advantages of a micropore zeolite molecular sieve can be combined, and the prepared catalyst has favorable catalytic activity and is suitable for fields of petrochemical industry and refined chemicals. The material adopts a multistage pore structure, besides, has an MFI micropore and MCM-41 mesoporous structure, and can be used for the fields of adsorption and separation and the like.

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 Applications(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