A Novel Magnetically Recyclable Catalyst: Molybdenum Oxide Supported on Hydroxyapatite-encapsulated γ-Fe2O3 for Olefin Epoxidation

doi:10.1016/S1872-2067(10)60226-4

Abstract

Abstract: Hydroxyapatite-encapsulated magnetic γ-Fe₂O₃ (HAP-γ-Fe₂O₃) was synthesized and used as catalyst support. Molybdenum oxide nanoparticles were supported on HAP-γ-Fe₂O₃ by incipient wetness impregnation (MoO_x/HAP-γ-Fe₂O₃). High-resolution transmission electron microscopy characterization demonstrated the formation of γ-Fe₂O₃ nanocrystallites with a mean diameter of 1–3 nm within the HAP matrix. The molybdenum oxide dispersed on the surface of HAP-γ-Fe₂O₃ showed good catalytic activities for the epoxidation of various olefins with tert-butyl hydroperoxide as oxidant. The magnetism of MoO_x/HAP-γ-Fe₂O₃ provided a convenient route for the separation of the catalyst from the reaction mixture by a magnet. The catalyst was recycled at least five times without appreciable loss of catalytic activity.

Key words: hydroxyapatite, epoxidation, tert-butyl hydroperoxide, supported molybdenum catalyst, magnetic separation

YUAN Cheng-Yuan, ZHANG Yan, CHEN Jing. A Novel Magnetically Recyclable Catalyst: Molybdenum Oxide Supported on Hydroxyapatite-encapsulated γ-Fe2O3 for Olefin Epoxidation[J]. Chinese Journal of Catalysis, 2011, 32(7): 1166-1172.

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