A kind of preparation method of micro-mesoporous ZSM-5 molecular sieve

A technology of ZSM-5 and molecular sieve, which is applied in the direction of crystalline aluminosilicate zeolite, borocarbane silicone crystalline aluminosilicate zeolite, etc., can solve the problems of environmental pollution and high price, and achieve low economic cost, simple operation, The effect of mild conditions

Active Publication Date: 2021-08-10
XI'AN POLYTECHNIC UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, in the preparation process, the price of tetraethyl orthosilicate and organic ammonia is not only expensive, but also excessive use of organic ammonia will cause environmental pollution

Method used

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  • A kind of preparation method of micro-mesoporous ZSM-5 molecular sieve
  • A kind of preparation method of micro-mesoporous ZSM-5 molecular sieve
  • A kind of preparation method of micro-mesoporous ZSM-5 molecular sieve

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[0030] A method for preparing micro-mesoporous ZSM-5 molecular sieves, using attapulgite after alkali-acid pretreatment as a silicon source, ammonia water as a template agent, sodium hydroxide as a post-treatment pore-forming agent, and aluminum sulfate octadecahydrate as supplementary aluminum Source, synthesized by hydrothermal crystallization method, specifically according to the steps:

[0031] Step 1, the attapulgite is subjected to alkali-acid pretreatment to obtain silicon source powder, specifically according to the following steps:

[0032] Step 1.1, mix powdered attapulgite and sodium hydroxide with a mass ratio of 1:1, calcinate at a high temperature of 550°C for 2 hours, take out and grind after cooling to obtain a mixture, add water to the mixture and stir evenly, After drying and cooling, add a sodium chloride solution with a concentration of 1mol / L and mix evenly, wherein the mass volume ratio of the mixture to the sodium chloride solution is 1g:10mL, filter wit...

Embodiment 1

[0043] The present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0044] A method for preparing micro-mesoporous ZSM-5 molecular sieves, using attapulgite after alkali-acid pretreatment as a silicon source, ammonia water as a template agent, sodium hydroxide as a post-treatment pore-forming agent, and aluminum sulfate octadecahydrate as supplementary aluminum Source, synthesized by hydrothermal crystallization method, specifically according to the steps:

[0045] Step 1, the attapulgite is subjected to alkali-acid pretreatment to obtain silicon source powder, specifically according to the following steps:

[0046] Step 1.1, mix powdered attapulgite and sodium hydroxide with a mass ratio of 1:1, calcinate at a high temperature of 550°C for 2 hours, take out and grind after cooling to obtain a mixture, add water to the mixture and stir evenly, After drying and cooling, add a sodium chloride solution with a c...

Embodiment 2

[0052] The present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0053] A method for preparing micro-mesoporous ZSM-5 molecular sieves, using attapulgite after alkali-acid pretreatment as a silicon source, ammonia water as a template agent, sodium hydroxide as a post-treatment pore-forming agent, and aluminum sulfate octadecahydrate as supplementary aluminum Source, synthesized by hydrothermal crystallization method, specifically according to the steps:

[0054] Step 1, the attapulgite is subjected to alkali-acid pretreatment to obtain silicon source powder, specifically according to the following steps:

[0055] Step 1.1, mix powdered attapulgite and sodium hydroxide with a mass ratio of 1:1, calcinate at a high temperature of 550°C for 2 hours, take out and grind after cooling to obtain a mixture, add water to the mixture and stir evenly, After drying and cooling, add a sodium chloride solution with a c...

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Abstract

The invention discloses a preparation method of a micro-mesoporous ZSM-5 molecular sieve, which uses attapulgite pretreated by alkali acid as a silicon source, ammonia water as a template agent, sodium hydroxide as a post-treatment pore-forming agent, and octadecadecane hydrated sulfuric acid Aluminum is a supplementary aluminum source, which is synthesized by hydrothermal crystallization. The preparation method of the micro-mesoporous ZSM-5 molecular sieve of the present invention can synthesize a ZSM-5 molecular sieve with uniform crystal form, regular shape, uniform pore size distribution, large specific surface area and large pore volume; simple operation, cheap and easy-to-obtain raw materials, low economic cost, High synthesis efficiency; mild conditions, non-toxic and environmentally friendly.

Description

technical field [0001] The invention belongs to the technical field of molecular sieve preparation, and relates to a method for preparing a micro-mesoporous ZSM-5 molecular sieve. Background technique [0002] ZSM-5 zeolite molecular sieve is a typical high-silicon five-membered ring zeolite and a typical molecular sieve with five-membered ring structural units. Its most basic structural units are silicon-oxygen tetrahedron and aluminum-oxygen tetrahedron, and its shape is usually plate shape. Because of its unique pore structure, large specific surface area, good adsorption performance and many other advantages, it is currently one of the most important adsorption catalytic materials in synthetic zeolites. However, ZSM-5 molecular sieve has a single pore size and small size, which limits the diffusion of molecules, and the adsorption effect on macromolecular organic matter is poor, which seriously affects its adsorption and catalytic performance. [0003] At present, when...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B39/38
CPCC01B39/38C01P2002/72C01P2002/82C01P2004/03
Inventor 李红玑王发良
Owner XI'AN POLYTECHNIC UNIVERSITY
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