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Method for synthesizing mesoporous molecular sieve with low water quantity and low template agent

A technology of mesoporous molecular sieve and template agent, which is applied in the directions of crystalline aluminosilicate zeolite, fajhedral crystalline aluminosilicate zeolite, etc., can solve the problems of large consumption of template agent, large water consumption and high synthesis cost, and achieve hydrophilicity. The effect of increasing the performance, reducing the consumption and reducing the cost

Active Publication Date: 2022-04-01
BEIJING UNIV OF CHEM TECH +3
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0015] The technical problem to be solved by the present invention is how to solve the problem of high consumption of template agent and large water consumption in the synthesis process of existing mesoporous molecular sieves, resulting in high synthesis cost

Method used

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  • Method for synthesizing mesoporous molecular sieve with low water quantity and low template agent
  • Method for synthesizing mesoporous molecular sieve with low water quantity and low template agent
  • Method for synthesizing mesoporous molecular sieve with low water quantity and low template agent

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] Synthesis of Microporous Molecular Sieve Precursor 1 Solution:

[0041] Using ethyl orthosilicate as the silicon source and aluminum chloride as the aluminum source, mix ethyl orthosilicate, aluminum chloride, sodium oxide and water, and the reactant is Al in molar ratio 2 o 3 :Na 2 O:SiO 2 :H 2 O=1:10:18:380; the above mixture was placed at 40° C. and stirred for 15 hours to prepare a precursor 1 solution.

Embodiment 2

[0043] Synthesis of Microporous Molecular Sieve Precursor 2 Solution:

[0044] Using water glass as the silicon source and aluminum nitrate as the aluminum source, mix water glass, aluminum nitrate, sodium oxide and water, and the reactants are calculated as Al in molar ratio. 2 o 3 :Na 2 O:SiO 2 :H 2 O=1:15:10:400; the above mixture was placed at 66° C. and stirred for 12 hours to prepare a precursor 2 solution.

Embodiment 3

[0046] Synthesis of Microporous Molecular Sieve Precursor 3 Solution:

[0047] Using silicon powder as the silicon source and aluminum sulfate octadecahydrate as the aluminum source, mix silicon powder, aluminum sulfate octadecahydrate, sodium oxide and water, and the reactants are calculated as Al in molar ratio. 2 o 3 :Na 2 O:SiO 2 :H 2 O=1:10:20:260; the above mixture was placed at 75° C. and stirred for 10 h to prepare a precursor 3 solution.

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Abstract

The invention discloses a method for synthesizing a mesoporous molecular sieve with low water quantity and low template agent. The method comprises the following steps: (1) preparing a Y-type molecular sieve precursor; and (2) synthesizing the mesoporous molecular sieve by using a polyoxyethylene nonionic surfactant and an auxiliary block nonionic surfactant. A composite system composed of a polyoxyethylene nonionic surfactant / block nonionic surfactant is used as a template agent for synthesis of the mesoporous molecular sieve, when the polyoxyethylene nonionic surfactant is added into water, spatial configuration changes to form a large hydrophilic group, and meanwhile, due to hydrophilicity of hydroxyl and a C-O bond, the hydrophilic group can form a large hydrophilic group; the hydrophilicity of the mixed micelle is increased, so that the assembly between inorganic species and a template agent is facilitated, and the molecular sieve with good orderliness is obtained; in the process of synthesizing the mesoporous molecular sieve by adopting the method, the dosage of the template agent and the water is greatly reduced, so that the purpose of reducing the cost is achieved, and a foundation is laid for further industrial application of the mesoporous molecular sieve.

Description

technical field [0001] The invention relates to a method for synthesizing a mesoporous molecular sieve with a composite template agent, in particular to a method for synthesizing a mesoporous molecular sieve with a low water content and a low template agent. Background technique [0002] Mesoporous molecular sieves are considered to have broad prospects in the field of conversion of heavy oil macromolecules due to their large specific surface area, regular and adjustable pore structure and other excellent properties. However, the poor hydrothermal stability due to the amorphous structure of the pore wall greatly limits its application in harsh chemical processes, such as in the catalytic cracking (FCC) process. The precursor assembly technology introduces the primary and secondary structural units of microporous molecular sieves into the pore walls of mesoporous molecular sieves, improving the hydrothermal stability of mesoporous molecular sieves. However, there are still s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B39/24C01B39/04
Inventor 刘洪涛李云闯席亚男汪杰刘海燕岳源源
Owner BEIJING UNIV OF CHEM TECH