CAJ | 학술논문

制备了羟基磷灰石(HAP)包覆纳米γ-Fe2O3颗粒复合材料(HAP-γ-Fe2O3),并进一步采用浸渍法担载氧化钼(MoOx/HAP-γ-Fe2O3).高分辨透射电镜结果表明,γ-Fe2O3纳米颗粒被包覆于HAP当中,平均粒径为1～3 nm.所制各催化剂对以叔丁基过氧化氢为氧化剂的烯烃环氧化反应显示了良好的催化活性,此外,催化剂的可磁力分离特性为反应后催化剂的分离回收提供了一种方便、快捷的途径.催化剂町重复使用至少5次以上而没有显著的活性下降.
제비료간기린회석(HAP)포복납미γ-Fe2O3과립복합재료(HAP-γ-Fe2O3),병진일보채용침지법담재양화목(MoOx/HAP-γ-Fe2O3).고분변투사전경결과표명,γ-Fe2O3납미과립피포복우HAP당중,평균립경위1～3 nm.소제각최화제대이숙정기과양화경위양화제적희경배양화반응현시료량호적최화활성,차외,최화제적가자력분리특성위반응후최화제적분리회수제공료일충방편、쾌첩적도경.최화제정중복사용지소5차이상이몰유현저적활성하강.
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 (MoOx/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 MoOx/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.