ZSM-5 molecular sieve and synthesis method thereof

Abstract

The invention provides a synthesis method of a ZSM-5 molecular sieve. The synthesis method comprises mixing a modified filtrate, a silicon source, an aluminum source and a template, and carrying out crystallization on the mixture, wherein the modified filtrate is obtained by anion exchange resin-based exchange of the ZSM-5 molecular sieve crystallization filtrate. The invention provides the ZSM-5 molecular sieve obtained by the synthesis method. The synthesis method realizes synthesis of high-crystallization degree, high silica-alumina ratio and low sodium content ZSM-5 molecular sieve from the crystallization mother liquor.

Description

technical field [0001] The invention relates to a ZSM-5 molecular sieve and a synthesis method thereof. Background technique [0002] ZSM-5 was first invented by Mobil Corporation of the United States. It has the advantages of high silicon-aluminum ratio, acid and alkali resistance, good thermal stability and hydrothermal stability, and has a three-dimensional cross-channel structure. This unique pore structure and stable thermal and hydrothermal properties make it an ideal material in the field of shape-selective catalysis, and has been widely used in catalytic cracking, alkylation, isomerization, dewaxing, etherification, methanol to gasoline And other petroleum processing, petrochemical fields. [0003] The synthesis method of ZSM-5 molecular sieve is generally divided into amine-based synthesis using organic amine as a template and amine-free synthesis without using an organic template. The amine-free synthesis of ZSM-5 molecular sieve is due to the low silicon-alumina ...

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Problems solved by technology

[0007] In the above method of synthesizing ZSM-5 molecular sieve, there is generally the problem of low silicon-aluminum ratio of ZSM-5 molecular sieve or sodium-type molecular sieve is generally produced, which requires inorganic ammonium salt for ion exchange, accompanied by a large amount of ammonia nitrogen wastewater discharge, which has a serious impact on the environment.

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