Method for preparing composite molecular sieve of ZSM 5/ mordenite

Abstract

The invention relates to a preparation method of the ZSM-5 / mordenite compound molecular sieve, mainly solves the complex question which needs to add the seed crystal or subsect the crystallization in the existing compound molecular sieve synthesize process. Through controls the certain silicon aluminum ratio and the pH value in the molecular sieve synthesize process, the invention prepares the compound molecular sieve with the adjustable ZSM-5 and the mordenite proportion, the technical program solves the problem preferably. The molecular sieve which is prepared by the invention can be used in the industrial production of the naphtha catalytic pyrolysis system ethylene propylene.

Description

technical field

[0001] The invention relates to a preparation method of ZSM-5 / mordenite composite molecular sieve. Background technique

[0002] ZSM-5 molecular sieve and mordenite are widely used in petrochemical and other fields due to their good shape-selective catalytic performance and good thermal stability. However, because the two molecular sieves have uniform and single pore sizes, they cannot handle complex components separately, and their catalytic properties for the same reactants are different. Composite molecular sieves containing two components can handle complex components with different molecular diameters, and can also exert their synergistic catalytic effect.

[0003] Documents CN1565967A and CN1565970A report using ZSM-5 molecular sieve or mordenite as a seed crystal, respectively adding mordenite or ZSM-5 molecular sieve to the synthesis solution, and synthesizing a mixed crystal material of ZSM-5 and mordenite. Its catalytic effect is better than the e...

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