[PZnMo 2W 9O 39] 5- immobilized on ionic liquid-modified silica as a heterogeneous catalyst for epoxidation of olefins with hydrogen peroxide

Abstract

The epoxidation of alkenes with hydrogen peroxide catalyzed by [PZnMo 2W 9O 39] 5-, ZnPOM, supported on ionic liquid-modified silica, Im-SiO 2, is reported. The immobilized catalyst, [ZnPOM@Im-SiO 2] was characterized by elemental analysis, X-ray diffraction (XRD), scanning electron microscopy (SEM), FT-IR and UV-Vis spectroscopic methods. This new synthesized hybrid catalyst was applied for efficient epoxidation of various olefins with aqueous H 2O 2 in acetonitrile under reflux conditions. This solid catalyst can be easily recovered by simple filtration and reused several times without significant loss of its catalytic activity. © 2012 Published by Elsevier Masson SAS on behalf of Académie des sciences.