纳米二氧化钛催化苯乙烯环氧化反应的研究  

Study on Nanometer TiO_2 in Catalystic Epoxidation of Styrene

作　　者：戚建英[1] 杨启云[1] 刘振义[1] 李贤均[2] 

机构地区：[1]云南师范大学化学系,昆明650031 [2]四川大学化学系,成都610064

出　　处：《分子催化》2000年第4期294-296,共3页Journal of Molecular Catalysis(China)

基　　金：云南省教委应用基础研究资助课题

摘　　要：The nanometer TiO 2 and nanometer TiO 2/EtOH catalysts were prepared from Ti(SO 4) 2 by the liquid phase method. The properties of these catalysts were characterized using TG DTA, IR, XRD and TEM methods.. The results show that both TiO 2 and TiO 2/EtOH are anatase with the particle sizes of about 60 nm possessing excellent thermal stability. The activities and selectivities of catalysts in styrene epoxidation with t butyl hydroperoxide (TBPH) were examined and the influence of different solvents on catalytic performance was examined. When the oxidation is carried out under suitable conditions, the main product and byproduct are styrene peroxide and phenylformaldehyde, respectively. The conversion of styrene and selectivity to epoxide over nanometer TiO 2/EtOH catalyst are 34.7% and 60.0% , respectively. When cyclohexanone or 1,4 dioxane are used as solvents, the selectivity to epoxide is more than 70%. The ethanol supported nanometer TiO 2 improved the activity obviously and the suitable solvents increased the selectivity to epoxide.The nanometer TiO 2 and nanometer TiO 2/EtOH catalysts were prepared from Ti(SO 4) 2 by the liquid phase method. The properties of these catalysts were characterized using TG DTA, IR, XRD and TEM methods.. The results show that both TiO 2 and TiO 2/EtOH are anatase with the particle sizes of about 60 nm possessing excellent thermal stability. The activities and selectivities of catalysts in styrene epoxidation with t butyl hydroperoxide (TBPH) were examined and the influence of different solvents on catalytic performance was examined. When the oxidation is carried out under suitable conditions, the main product and byproduct are styrene peroxide and phenylformaldehyde, respectively. The conversion of styrene and selectivity to epoxide over nanometer TiO 2/EtOH catalyst are 34.7% and 60.0% , respectively. When cyclohexanone or 1,4 dioxane are used as solvents, the selectivity to epoxide is more than 70%. The ethanol supported nanometer TiO 2 improved the activity obviously and the suitable solvents increased the selectivity to epoxide.

关 键 词：催化 苯乙烯 环氧化 二氧化钛 纳米级 

分 类 号：O625.12[理学—有机化学] O621.256.9[理学—化学]