A kind of preparation method of hollow multi-stage pore zsm-5 molecular sieve

A ZSM-5, multi-level pore technology, applied in the direction of crystalline aluminosilicate zeolite, borocarbane silicone crystalline aluminosilicate zeolite, etc., can solve the problems of poor molecular sieve dispersion and single pore size, and achieve high dispersion Effect

Active Publication Date: 2021-07-02
HARBIN INST OF TECH
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  • Description
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  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The present invention aims to solve the technical problems of the existing ZSM-5 molecular sieve with single pore size and poor molecular sieve dispersion, and provides a method for preparing a hollow multi-stage porous ZSM-5 molecular sieve

Method used

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  • A kind of preparation method of hollow multi-stage pore zsm-5 molecular sieve
  • A kind of preparation method of hollow multi-stage pore zsm-5 molecular sieve
  • A kind of preparation method of hollow multi-stage pore zsm-5 molecular sieve

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specific Embodiment approach 1

[0025] Specific embodiment one: the preparation method of the hollow multi-stage porous ZSM-5 molecular sieve of the present embodiment is carried out according to the following steps:

[0026] 1. Weigh silicon source, aluminum source, inorganic base, organic template, water and surfactant; wherein the molar ratio of silicon source, aluminum source, inorganic base, organic template to water is 1: (0.03~0.05): (0.2~0.5): (0.01~1): (30~50); the amount of surfactant added is (0.7~3)×10 of the molar amount of the organic template -3 times; wherein the surfactant is polyvinylpyrrolidone (PVP) or ethylenediaminetetraacetic acid disodium salt (EDTA-disodium);

[0027] 2. Mix surfactant, water, inorganic base and aluminum source evenly to obtain solution A;

[0028] 3. Add silicon source dropwise to solution A. After the dropwise addition, stir for 4-5 hours at a temperature of 70-90°C to obtain solution B;

[0029] 4. Add the organic template agent dropwise to the solution B. After...

specific Embodiment approach 2

[0032] Embodiment 2: This embodiment is different from Embodiment 1 in that the inorganic base described in step 1 is sodium hydroxide, ammonia water or potassium hydroxide. Others are the same as in the first embodiment.

specific Embodiment approach 3

[0033] Embodiment 3: The difference between this embodiment and Embodiment 1 or 2 is that the aluminum source described in step 1 is one or a combination of aluminum nitrate, sodium metaaluminate and aluminum sulfate. Others are the same as in the first or second embodiment.

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Abstract

A kind of preparation method of hollow multi-stage hole ZSM-5 molecular sieve, the present invention relates to the preparation method of ZSM-5 molecular sieve, the present invention is to solve the technology that existing ZSM-5 molecular sieve aperture distribution is single, dispersion is poor, hydrothermal stability is poor question. In this method, the surfactant, water, inorganic alkali and aluminum source are mixed uniformly first, then the silicon source is added dropwise, stirred at 70-90°C, then the organic template is added, and then stirred at 70-90°C, and then hydrothermally Crystallization and calcination to obtain a hollow hierarchical porous ZSM-5 molecular sieve, which has a composite hierarchical porous structure of mesoporous micropores, high dispersion, and can be used in catalytic reactions.

Description

technical field [0001] The invention relates to a preparation method of ZSM-5 molecular sieve, belonging to the technical field of molecular sieve synthesis. Background technique [0002] The crystal structure of ZSM-5 molecular sieve belongs to the orthorhombic system, which is composed of silicon (aluminum) oxygen tetrahedrons connected by oxygen bridge bonds and has a two-dimensional ten-membered ring channel, and its basic structural unit is composed of eight five-membered rings. . The channel structure is composed of cross-sectioned straight channels with an elliptical cross section (the channel size is 0.54nm×0.56nm) and zigzag channels with an approximately circular cross section (the channel size is 0.52nm×0.58nm). Its channels, i.e. its cavities, do not have cages like A, X and Y zeolites. ZSM-5 molecular sieve has a stable skeleton structure, adjustable pore size, high specific surface area, good shape selectivity, and good water and thermal stability, so it is m...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B39/40
CPCC01B39/40C01P2004/34C01P2004/61C01P2004/62C01P2006/12C01P2006/17
Inventor 杨春晖牛晓冉雷作涛李季
Owner HARBIN INST OF TECH
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