纳米磁性颗粒负载的银催化剂催化苯乙烯环氧化反应(英文)  

Nanostructured Maghemite-Supported Silver Catalysts for Styrene Epoxidation

作　　者：潘珍燕[1] 华丽[1] 乔云香[1] 杨汉民[2] 赵秀阁[1] 冯博[1] 朱闻闻[1] 侯震山[1] 

机构地区：[1]华东理工大学工业催化研究所,结构可控先进功能材料及其制备教育部重点实验室上海200237 [2]中南民族大学催化材料科学湖北省重点实验室,湖北武汉430074

出　　处：《催化学报》2011年第3期428-435,共8页

基　　金：Supported by the National Natural Science Foundation of China(20773037,21073058);the Research Fund for the Doctoral Program of Higher Education of China(20100074110014);the Key Laboratory of Catalysis and Materials Science of the State Ethnic Affairs Commission and Ministry of Education,Hubei Province,South-Central University for Nationalities(CHCL10001),China

摘　　要：采用简单浸渍和液相还原法制备了Ag/KOH-γ-Fe2O3催化剂,并采用X射线衍射、透射电镜和X射线光电子能谱等方法对催化剂进行了表征.结果表明,在乙酸乙酯介质中,以叔丁基过氧化氢为氧化剂,该催化剂具有较高的催化苯乙烯环氧化活性,KOH的添加可大幅度提高环氧化反应活性和选择性.表征结果显示,反应前后催化剂性质没有发生明显的变化.另外,所使用的磁性载体有利于负载型银催化剂的分离和循环利用.The supported silver catalyst Ag/KOH-γ-Fe2O3 was prepared by simple impregnation and liquid reduction and then structurally characterized by X-ray diffraction, transmission electron microscopy, and X-ray photoelectron spectroscopy. The supported silver catalysts were highly efficient for the epoxidation of styrene using tert-butyl hydroperoxide as the oxidant and ethyl acetate as the reaction medium.The addition of KOH was found to increase the catalytic activity and selectivity significantly. Additionally, the magnetically recoverable γ-Fe2O3, as a support, allowed for an easy separation and recycling of the catalyst after the reaction.

关 键 词：γ-氧化铁 环氧化 苯乙烯 银 纳米颗粒 磁分离 

分 类 号：O643.32[理学—物理化学]