Sn-y type molecular sieve, preparation method therefor and use thereof, and oxidation reaction method for cyclic ketone

By centrally distributing Sn species on the outer surface of Y molecular sieve, the problem of diffusion limitation of Sn-beta molecular sieve channel is solved, the catalytic performance and selectivity of cycloketone oxidation reaction are improved, and it is suitable for industrial production.

WO2025175908A1 Publication Date: 2025-08-28CHINA PETROLEUM & CHEMICAL CORP +1
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Patent Information

Application Number
PCT/CN2024/142257
Authority / Receiving Office
WO · WO
Patent Type
Applications
Current Assignee / Owner
Priority Date
2024-02-20
Filing Date
2024-12-25
Publication Date
2025-08-28

AI Technical Summary

Technical Problem

The existing Sn-beta molecular sieve has deteriorated catalytic performance due to channel diffusion limitation and water adsorption in the Baeyer-Villiger reaction of cyclohexanone, and the distribution of Sn species is not conducive to the contact of reactant molecules, affecting the catalytic effect.

Method used

Through solid-phase ion exchange and water vapor + oxygen treatment methods, Sn is mainly distributed on the outer surface of the Y molecular sieve to form a four-coordinated skeleton Sn, which improves the proximity and utilization of the Lewis acidic position.

Benefits of technology

It achieves higher activity and selectivity in cycloketone oxidation reaction, is almost unlimited by diffusion rate, is simple to operate and low cost, and is suitable for industrial production.

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Abstract

An Sn-Y type molecular sieve, a preparation method therefor and the use thereof, and an oxidation reaction method for a cyclic ketone. The surface silicon / tin molar ratio of the molecular sieve is 50-70, and the bulk silicon / tin molar ratio is 200-300; with respect to the Sn-Y type molecular sieve, Sn is mainly intensively distributed on the outer surface of a Y molecular sieve, thus achieving better catalytic performance for the Baeyer-Villiger oxidation reaction of a cyclic ketone.
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