Abstract
Hydroxyapatite-encapsulated magnetic γ-Fe 2 O 3 (HAP-γ-Fe 2 O 3 ) was synthesized and used as catalyst support. Molybdenum oxide nanoparticles were supported on HAP-γ-Fe 2 O 3 by incipient wetness impregnation (MoO x /HAP-γ-Fe 2 O 3 ). High-resolution transmission electron microscopy characterization demonstrated the formation of γ-Fe 2 O 3 nanocrystallites with a mean diameter of 1–3 nm within the HAP matrix. The molybdenum oxide dispersed on the surface of HAP-γ-Fe 2 O 3 showed good catalytic activities for the epoxidation of various olefins with tert -butyl hydroperoxide as oxidant. The magnetism of MoO x /HAP-γ-Fe 2 O 3 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.
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