关键词: 纳米TiO₂, 表征, 苯乙烯环氧化

Abstract: The catalysts of nanometer TiO₂/EtOH, nanometer TiO₂/#em/em#-PrOH and nanometer TiO₂/EtOH-BuOH were prepared by the liquid-phase method from Ti(SO₄)₂in different alcohols. The properties of the catalysts were characterized by TG-DTA, IR, XRD and TEM methods. The results showed that the nanometer TiO₂/#em/em#-PrOH was 20nm×20nm anatase particle with an excellent thermal stability. The activities and selectivities of the catalysts in styrene epoxidation with t-butyl hydroperoxide(TBPH) were studied and compared with the commercial TiO_2.When the oxidation was carried out under a suitable condition the main product and by product were styrene peroxide and phenylformaldehyde, respectively. The conversion of styrene and the selectivity of epoxide at 80 were 33.4% and 70.2% over the catalyst of nanometer TiO₂/#em/em#-PrOH, respectively. The activity of commercial TiO₂was only 1/3 that of nanometer TiO₂/#em/em#-PrOH. The iso-propanol supported nanometer TiO₂improved obviously the activity and selectivity in the epoxidation of styrene.