Synthetic method of mesoporous-microporous composite ZSM-5/MCM-41 molecular sieve

A technology of MCM-41 and ZSM-5, applied in the field of synthesis of microporous-mesoporous composite ZSM-5/MCM-41 molecular sieve, can solve problems such as environmental pollution
CN102464329AActive Publication Date: 2012-05-23PETROCHINA CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
PETROCHINA CO LTD
Publication Date
2012-05-23

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Abstract

The invention relates to a synthetic method of a mesoporous-microporous composite ZSM-5 / MCM-41 molecular sieve. The method comprises the steps of: adding a ZSM-5 microporous molecular sieve into acid or alkali solution, wherein the hydrogen ion concentration in the acid solution is 0.1 mol / L to 1.0 mol / L, the hydroxy radical concentration in the acid solution is 0.1 mol / L to 0.5 mol / L, and the mass ratio of liquid to solid is 30; dissolving CTAB (Cetyltrimethyl Ammonium Bromide) into water, adding a silicon source or the silicon source and an aluminum source to obtain clear solution, adding the ZSM-5 which is etched by acid or alkali, regulating pH value by sulfuric acid with the concentration of 2 mol / L, crystallizing, filtering, drying and roasting, wherein the mass ratio of ZSM-5 to CTAB is 0.08 to 0.39, and the molar ratio of SiO2 to CTAB to H2O in a synthetic gel system is 1 to 0.15 to (60-120). The method has the advantages of simple operation and good reproducibility.
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Description

Technical field

[0001] The invention relates to a method for synthesizing microporous-mesoporous composite ZSM-5 / MCM-41 molecular sieve. Background technique

[0002] The research on the microporous-mesoporous composite molecular sieve first started with the one-step continuous synthesis process reported by Kloetstra to grow MCM-41 mesoporous molecular sieve on the surface of faujasite (FAU) (KRKloetstra et al. Microporous Material., 1996 , 6: 287~293). In this technology, FAU is exchanged with the surfactant cetyltrimethylammonium bromide (CTAB) in advance to obtain a surface rich in CTAB cations, and MCM-41 is grown by self-assembly of inorganic species to prepare FAU / MCM- 41 composite molecular sieve. This assembly method is limited to low-silicon type microporous molecular sieve, and the process is relatively complicated.

[0003] Karlsson et al. used CTAB and tetradecyltrimethylammonium bromide as two templates, and after two-step crystallization, they successfully prepared...

Claims

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