Preparation method of mesoporous LTA zeolite

A mesoporous and zeolite technology, applied in the field of preparation of mesoporous LTA zeolite, can solve the problems of excessively wide mesopore pore size distribution, large mesopore pore size, poor acid strength and hydrothermal stability, etc. Simple operation and low cost of raw materials

Inactive Publication Date: 2012-06-20
TAIYUAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0008] The purpose of the present invention is to solve the problem that the mesoporous pore size of the conventional mesoporous zeolite is too large, and the mesoporous pore size distribution is too wide, resulting in poor acid strength and hydrothermal stability, and to provide a simple, low-cost mesoporous The preparation method of LTA zeolite

Method used

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  • Preparation method of mesoporous LTA zeolite
  • Preparation method of mesoporous LTA zeolite
  • Preparation method of mesoporous LTA zeolite

Examples

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Embodiment 1

[0024] Prepare bridged silsesquioxane (structural formula shown in formula I) by reacting 3-(2,3-glycidoxy)propyltrimethoxysilane and 3-aminopropylmethyldimethoxysilane; Weigh 0.750g of sodium silicate and dissolve it in 4ml of deionized water. At 35°C, take 0.103g of bridged silsesquioxane and add it dropwise to the above sodium silicate solution, and stir well until the solution is clear. Weigh 0.369g of sodium metaaluminate and dissolve it in 4ml of deionized water, then slowly add the above mixed liquid into the sodium metaaluminate solution dropwise, stir at 35°C for 30min, the molar composition of the reaction solution is: 2.173 Na 2 O : Al 2 o 3 : 1.173 SiO 2 : 0.0720 Bridged silsesquioxane: 208 H 2 O. The reaction solution was transferred to a stainless steel reaction kettle, crystallized at 100°C for 120 hours, cooled, washed with a large amount of ionized water until neutral, dried at 100°C for 2 hours, then placed in a muffle furnace, and roasted in an air atm...

Embodiment 2

[0029] Prepare bridged silsesquioxane by reacting 3-(2,3-glycidoxy)propyltrimethoxysilane and 3-aminopropylmethyldimethoxysilane (the structural formula is shown in formula II); Weigh 0.750g of sodium silicate and dissolve it in 4ml of deionized water. At 35°C, take 0.184g of bridged silsesquioxane and add it dropwise to the above sodium silicate solution, and stir well until the solution is clear. Weigh 0.369g of sodium metaaluminate and dissolve it in 4ml of deionized water, then slowly add the above mixed liquid into the sodium metaaluminate solution dropwise, stir at 35°C for 30min, the molar composition of the reaction solution is: 2.173 Na 2 O : Al 2 o 3 : 1.173 SiO 2 : 0.129 Bridged silsesquioxane: 208 H 2 O. The reaction solution was transferred to a stainless steel reaction kettle, crystallized at 100°C for 168 hours, cooled, washed with a large amount of ionized water until neutral, dried at 100°C for 2 hours, then placed in a muffle furnace, and roasted in an ...

Embodiment 3

[0035] Prepare bridged silsesquioxane by reacting 3-(2,3-glycidoxy)propyltrimethoxysilane and 3-aminopropylmethyldimethoxysilane (the structural formula is shown in formula III); Weigh 0.750g of sodium silicate and dissolve it in 4ml of deionized water. At 35°C, take 0.220g of bridged silsesquioxane and add it dropwise to the above sodium silicate solution, and stir well until the solution is clear. Weigh 0.369g of sodium metaaluminate and dissolve it in 4ml of deionized water, then slowly add the above mixed liquid into the sodium metaaluminate solution dropwise, stir at 35°C for 30min, the molar composition of the reaction solution is: 2.173 Na 2 O : Al 2 o 3 : 1.173 SiO 2 : 0.154 Bridged silsesquioxane: 208 H 2 O. The reaction solution was transferred to a stainless steel reaction kettle, crystallized at 100°C for 192 hours, cooled, washed with a large amount of ionized water until neutral, dried at 100°C for 2 hours, then placed in a muffle furnace, and roasted in an...

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Abstract

A preparation method of a mesoporous LTA zeolite adopts a bridged silsesquioxane monomer as a mesoporous template, and comprises firstly mixing bridged silsesquioxane with silicon species solution, stirring to be clear, then slowly dripping the clear solution into aluminum species, stirring, placing into a reactor for hydrothermal crystallization, cooling, vacuum filtering, drying, and calcining to obtain the mesoporous LTA zeolite. The obtained mesoporous LTA zeolite crystals have microporous and mesoporous dual-model pore distribution, combines the pore channel advantage of a mesoporous material and strong acidity and high hydrothermal stability of microporous molecular sieves, and has unique ordered mesoporous channels, and have a wide application prospect in the fields of catalysis, adsorption and separation, etc. The invention has the advantages of easiness in operation and low raw material cost, and is suitable for large-scale production, etc.

Description

technical field [0001] The present invention relates to a preparation method of mesoporous LTA zeolite. Specifically, a bridged silsesquioxane monomer is used as a mesoporous template, and the bridged silsesquioxane and a silicon species solution are mixed and stirred until clarified. Finally, the mixed liquid is slowly added dropwise to the aluminum species and stirred, placed in a reaction kettle for hydrothermal crystallization, cooled, filtered with suction, dried, and calcined to obtain mesoporous LTA zeolite. The prepared mesoporous LTA zeolite crystal has a dual-model pore distribution of micropores and mesoporous pores, and combines the channel advantages of mesoporous materials with the strong acidity and high hydrothermal stability of microporous molecular sieves, and also has unique and regular mesoporous pores. tunnel. technical background [0002] Zeolite is a typical microporous solid material with crystalline structure. Due to its good ion exchange performanc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B39/04
Inventor 李福祥刘洪涛于峰薛建伟吕志平
Owner TAIYUAN UNIV OF TECH
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