ZSM-5 molecular sieve and preparation method thereof

Abstract

The invention relates to the technical field of chemical materials, and provides a ZSM‑5 molecular sieve and a preparation method thereof. A preparation method of ZSM‑5 molecular sieve, comprising: providing silicon source, aluminum source, quaternary ammonium template, phosphorus template, ethanol and water, and mixing it to obtain mixed gel; SiO in the mixed gel 2 with Al 2 o 3 The molar ratio between is (20‑200):1, quaternary ammonium template, phosphorus template, ethanol, water and SiO 2 The molar ratio between is (0.001-0.5):(0.001-0.5):(1-50):(0.2-50):1; the mixed gel is obtained after crystallization at 100-200°C for 6-72h The reaction product, from which the required ZSM-5 molecular sieve can be obtained. The preparation method of the ZSM-5 molecular sieve can prepare a ZSM-5 molecular sieve with a hierarchical pore structure containing both micropores and mesoporous pores, and the ZSM-5 molecular sieve has the advantages of high stability and good catalytic performance. The present invention also provides a ZSM‑5 molecular sieve.

Description

technical field [0001] The invention relates to the technical field of chemical materials, in particular to a preparation method of ZSM-5 molecular sieve. Background technique [0002] As a typical microporous molecular sieve, ZSM-5 molecular sieve has a wide range of applications. ZSM-5 molecular sieves can be used as solid acid catalysts, catalyst supports, adsorbents and ion exchangers, and can also be used in important industrial productions such as aromatic hydrocarbon alkylation, catalytic cracking, light hydrocarbon aromatization, and methanol to gasoline. Moreover, when ZSM-5 molecular sieve is used as a catalyst additive for FCC, it can increase the octane number of gasoline and increase the production of low-carbon olefins; in addition, ZSM-5 molecular sieve can also be widely used in shape-selective catalysis, such as p-diethylbenzene catalyst, xylene isomerization catalyst. [0003] ZSM-5 molecular sieve has a well-developed microporous structure, but its pore ...

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Problems solved by technology

Among them, the ZSM-5 molecular sieve prepared by the hydrothermal method has poor stability; while using the hard template method, due to the phase separation with the crystallization species of the molecular sieve during the crystallization process of the molecular sieve, the resulting mesoporous channels are limited and a large number of Irregular species affect the catalytic performance of ZSM-5 molecular sieve

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