MCM-41负载甲基三氧化铼的制备及其对环氧化反应的催化性能

Preparation of MCM-41 Supported Methyltrioxorhenium and Its Catalytic Performance on Epoxidation of Olefins

通过多步接枝法将双吡啶-甲基三氧化铼配合物负载到MCM-41上,获得多相化的甲基三氧化铼催化剂.通过傅里叶变换红外光谱、紫外-可见漫反射光谱、元素分析、原子吸收、X-光射线衍射以及氮气吸附等方法对负载催化剂进行了表征.将其用于过氧化氢、尿素过氧化氢络合物环氧化环己烯、苯乙烯以及1-辛烯的催化剂,显示很高的催化活性和环氧化物选择性,但循环使用性能较差.

A bipyridyl methyltrioxorhenium（MTO） complex was supported onto the surface of MCM-41 by a multi-step grafting method.The resulting supported MTO catalyst was characterized by FT-IR,DR UV-Vis,EA,AAS,XRD and nitrogen adsorption.The material was used as catalyst in the epoxidation of cylcohexene,styrene and 1-octanene with hydrogen peroxide and UHP as oxidants,respectively.Catalytic study results indicated that the heterogenized methyltrioxorhenium catalyst displayed highly active and selective performances when applied to the epoxidation of alkenes in general,but poor performance in the case of recycle run.