Highly efficient epoxidation of cyclohexene with aqueous H2O2 over powdered anion-resin supported solid catalysts

• An anion-exchange of powdered chloride-form resin with peroxo phosphotungstic acid is conducted.
• D201-peroxo phosphotungstic acid is highly active for the epoxidation of cyclohexene with H2O2.
• 92.4 mol% conversion and 98.1% selectivity of epoxide is achieved.
• The catalysts are highly reusable heterogeneous ones.

Resin supported solid acid catalysts have extended the application of conventional solid acid catalysts in the field of selective oxidations. The present work describes selectively catalytic epoxidation of cyclohexene with aqueous 30% H2O2 over powdered anion-resin supported peroxo phosphotungstic acid heterogeneous catalysts prepared through a simple anion-exchange from powdered chloride-form anion resin without any special pre-exchanged treatment. Among these powdered solid catalysts, anion-exchanged resin D201 supported peroxo phosphotungstic acid exhibits the best activity for the titled reaction to obtain 92.4 mol% conversion and 98.1% selectivity of epoxide, for which D201-PWAR(4) behaves as a truly heterogeneous catalyst. Some factors such as various peroxo phosphotungstic acid concentrations, the oxidants, the solvents, the molar ratios of H2O2/cyclohexene, the catalyst amount, the reaction temperature and time play important roles in controlling the epoxidation.

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