Highly Effective Propylene Epoxidation over TS-1/SiO_(2) Hydrothermally Treated  

作　　者：WeiGuoCHENG XiangShengWANG GangLI XinWenGUO QingSongLIN 

机构地区：[1]DepartmentofCatalysisChemistryandEngineeringandStateKeyLab.ofFineChem.,DalianUniv.ofTechnol.,Dalian116012

出　　处：《Chinese Chemical Letters》2005年第1期103-106,共4页中国化学快报（英文版）

基　　金：Supported by the National Key Basic Research Project of China(G2000048009);the Doctorate Foundation of Liaoning Province(2001102085)

摘　　要：The propylene epoxidation over TS-1/SiO2 catalyst hydrothermally treated was investigated. It was found by EPR characterization that two types of Ti (IV)-superoxide radicals, A (gz=2.0271; gy=2.0074; gx=2.0010) and B (gz=2.0247; gy= 2.0074; gx= 2.0010), were observed for TS-1/SiO2. The superoxo species A converted to B after TS-1/SiO2 catalyst was hydrothermally treated. The results show that over TS-1/SiO2 catalyst hydrothermally treated at 170℃, about 95% conversion of H2O2 with above 94% PO selectivity is obtained during continuous running for 300 h under the conditions of reaction temperature 45℃, 0.5 h-1WHSV of propylene.The propylene epoxidation over TS-1/SiO2 catalyst hydrothermally treated was investigated. It was found by EPR characterization that two types of Ti (IV)-superoxide radicals, A (gz=2.0271; gy=2.0074; gx=2.0010) and B (gz=2.0247; gy= 2.0074; gx= 2.0010), were observed for TS-1/SiO2. The superoxo species A converted to B after TS-1/SiO2 catalyst was hydrothermally treated. The results show that over TS-1/SiO2 catalyst hydrothermally treated at 170℃, about 95% conversion of H2O2 with above 94% PO selectivity is obtained during continuous running for 300 h under the conditions of reaction temperature 45℃, 0.5 h-1WHSV of propylene.

关 键 词：HYDROTHERMAL TS-1/SiO2 propylene epoxidation EPR radical. 

分 类 号：O623.425[理学—有机化学] O643.36[理学—化学]