Composite molecular sieve of MFI configuration molecular sieve and MCM-41 molecular sieve as well as preparation method and application of composite molecular sieve

By growing MCM-41 molecular sieves on the surface of MFI-configured molecular sieves, the problem of micro-mesoporous composite molecular sieve bonding was solved, which improved the catalytic activity and stability of the gas-phase Beckmann rearrangement reaction of cyclohexanone oxime and extended the catalyst lifetime.

CN122010135APending Publication Date: 2026-05-12CHINA PETROLEUM & CHEMICAL CORP +1
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Patent Information

Application Number
CN202411598492.9
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2024-11-11
Publication Date
2026-05-12

AI Technical Summary

Technical Problem

Existing micro-mesoporous composite molecular sieve materials suffer from mutual constraints when combining mesoporous and microporous molecular sieve structures, leading to easy phase separation in the synthesized materials and making it difficult to achieve efficient catalysis and stability in the gas-phase Beckmann rearrangement of cyclohexanone oxime.

Method used

By growing mesoporous MCM-41 molecular sieves on the surface of MFI-configured molecular sieves, and utilizing the affinity and hydrogen bonding of two template agents, a tightly bound micro-mesoporous composite molecular sieve is formed, which retains the active sites of the microporous molecular sieve and enhances molecular diffusion performance.

Benefits of technology

This study improved the activity and selectivity of the gas-phase Beckmann rearrangement reaction of cyclohexanone oxime, reduced coking and deactivation, and extended the catalyst's lifespan.

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Abstract

The invention relates to a composite molecular sieve of an MFI configuration molecular sieve and an MCM-41 molecular sieve, a preparation method of the composite molecular sieve and application of the composite molecular sieve in cyclohexanone-oxime gas-phase Beckmann rearrangement reaction. The preparation method of the composite molecular sieve comprises the following steps: providing a first molecular sieve containing a first template agent, and then preparing a second molecular sieve in the presence of a second template agent and the first molecular sieve containing the first template agent to obtain the composite molecular sieve, wherein the first template agent and the second template agent are different in chemical structure, and the first molecular sieve is an MFI configuration molecular sieve, and the second molecular sieve is an MCM-41 molecular sieve. The composite molecular sieve material is stable in structure, the active sites of the first molecular sieve can be retained, the introduction of the mesoporous channel structure is beneficial to improving the diffusion efficiency of reactants and products, the occurrence of polymerization reaction is reduced, and the effect of improving the activity and stability of the cyclohexanone-oxime gas phase Beckmann rearrangement reaction is achieved.
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