A polynuclear peroxotungstate-based homogeneous catalyst and its application to olefin epoxidation

CN122230802APending Publication Date: 2026-06-19FUZHOU UNIV +1

Patent Information

Authority / Receiving Office: CN · China
Patent Type: Applications(China)
Current Assignee / Owner: FUZHOU UNIV
Filing Date: 2026-03-11
Publication Date: 2026-06-19

AI Technical Summary

Technical Problem

Existing phase-transfer heteropolyacid catalysts have problems in the styrene epoxidation process, such as insufficient styrene conversion, instability of epoxide phenylene oxide leading to side reactions, long reaction time, and poor catalyst recycling performance.

Method used

A multinuclear peroxy tungsten-based catalyst was designed. By introducing electron-donating groups to protect the peroxy center and pre-constructing the active center of the peroxy bond, the catalyst can be regenerated by replenishing hydrogen peroxide. High-purity catalyst can be obtained by centrifugation and washing with pure water as solvent. The synthesis conditions are mild.

Benefits of technology

It achieves high-efficiency styrene epoxidation performance, good catalyst cycle stability, shortened epoxidation reaction time, high product selectivity, and easy catalyst recovery and reuse.

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Abstract

This invention discloses a polynuclear peroxytungsten-based homogeneous catalyst and its application in olefin epoxidation. By reacting a prepared peroxytungstic acid solution with an organophosphorus ligand / quaternary ammonium salt solution under stirring, a P catalyst with excellent catalytic activity and cycling stability is prepared. n W 2n This invention presents a polynuclear peroxytungsten-based homogeneous catalyst. Aromatic ligands effectively protect the peroxy active sites from polymerization into keggin-type polyacids and exhibit high catalytic stability. Furthermore, the catalyst has a simple and efficient recovery method. The preparation process is simple, and the catalyst demonstrates excellent catalytic performance in olefin epoxidation, particularly suitable for electron-rich olefins like styrene that produce π-π stacking effects. Styrene conversion and epoxide selectivity are both above 90%, and the catalyst can be reused more than five times without significant performance degradation. This solves the activity loss problem of traditional phase-transfer phosphotungstic acid catalysts and has broad industrial application prospects in styrene epoxidation.

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