Article ID Journal Published Year Pages File Type
66824 Journal of Molecular Catalysis A: Chemical 2010 7 Pages PDF
Abstract

The Mn2+-exchanged zeolites Mn-Y, Mn-beta, Mn-A and Mn-ZSM-5 were prepared and used as heterogeneous catalysts for the liquid phase epoxidation of alkenes with aqueous hydrogen peroxide (30% H2O2) at 273–298 K in the NaHCO3 buffer system. The structures of catalysts were characterized by powder X-ray diffraction (XRD), UV–vis, ICP, BET and IR techniques. Mn-beta and Mn-Y exhibited the best recyclable activity for the epoxidation of styrene to achieve styrene conversions higher than 96.0 and 98.5 mol%, respectively. Mn-beta showed higher activity for cyclohexene and norbornene but lower activity for α-methylstyrene, cinnamyl chloride, indene, cyclooctene and α-pinene than Mn-Y, which could be correlated with the difference of their pore sizes. However, these catalysts did not show any activity for the epoxidation of 1-octene with H2O2, possibly due to low electron density of double bonds of linear terminal alkenes.

Graphical abstractMn2+-exchanged zeolites Mn-beta, Mn-Y, Mn-ZSM-5, and Mn-A efficiently catalyzed the epoxidation of alkenes with 30% H2O2, in which Mn-beta and Mn-Y exhibited highly recyclable activity.Figure optionsDownload full-size imageDownload high-quality image (38 K)Download as PowerPoint slide

Related Topics
Physical Sciences and Engineering Chemical Engineering Catalysis
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