Iron modified sheet type ZSM-5 zeolite catalyst preparation method

Abstract

An iron modified sheet type ZSM-5 zeolite catalyst preparation method includes: subjecting an aluminum source to inertia or activating treatment; adding the treated aluminum source to glue solution prepared from a silicon source and a template agent to prepare a gel mixture under the condition of stirring, wherein mole composition of the gel mixture includes: SiO2 / Al2O3=10-1000, Na2O / SiO2=0-0.5, R / SiO2=0.2-2.0, H2O / SiO2=8-100, and R refers to the template agent; well mixing the gel mixture with an iron source to obtain iron modified gel, wherein the iron source accounts for 1%-10% of the totalmass of the iron modified gel; subjecting the prepared iron modified gel to hydrothermal crystallization, and subjecting solid obtained in crystallization to filtering, washing, drying and calciningto obtain iron modified sheet type ZSM-5 zeolite. The method has advantages that introduction of the template agent and a guide agent is avoided; different iron sources are adopted for modification toobtain products through a one-step method; product synthesis is realized without subsequent modification.

Description

technical field [0001] The invention relates to a preparation method of a thin-plate type FCC cocatalyst, in particular to a preparation method of an iron-modified thin-plate type ZSM-5 zeolite. Background technique [0002] ZSM-5 zeolite (USP 3702886) invented by American Mobil Petroleum Company has become a very important shape-selective catalytic material due to its unique pore structure and good catalytic performance. ZSM-5 zeolite is a promoter and catalyst for many traditional catalytic technologies such as catalytic cracking, toluene disproportionation, alkylation of benzene and toluene, and aromatization of low-carbon hydrocarbons. It is also the first choice for emerging coal chemical technologies such as methanol-to-gasoline and methanol-to-propylene. catalyst. [0003] Since ZSM-5 zeolite is a microporous zeolite, its pore size is small, which limits its application in macromolecular catalytic reactions to a certain extent. There are two main methods to solve th...

AI Technical Summary

Problems solved by technology

These two methods can effectively improve the activity of ZSM-5 zeolite catalysts, especially the anti-coking deactivation performance, but the problems of weak acidity and relatively low hydrothermal stability have always existed.

However, due to the limitation of special templates, the above method is difficult to spread, and it is even less likely to be used in industrial synthesis

Therefore, it is a very promising research to obtain this kind of thin-plate ZSM-5 zeolite using a synthetic system with easy-to-obtain raw materials and easy operation. At present, there is no patent report related to this content in China.

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