Styrene Epoxidation with t-Butyl Hydroperoxide Catalyzed by Nanometer TiO2(Ⅱ)

Abstract

Abstract: The catalysts of nanometer TiO₂/BuOHand hydrous TiO₂ were prepared by the liquid phase method from Ti(SO₄)₂. The properties of the catalysts were characterized by TG-DTA, IR, XRD, TEMmethods. The results showed that nanometer TiO₂/BuOHwas anatase particles with10 nm×20 nm. The main product in styrene epoxidation with t butyl hydroperoxide(TBPH) was styrene epoxide, by product was phenylformaldehyde under the condition of 80 ℃ for 6 h. Hydrous TiO₂ prepared below 260 ℃ was non crystal powder and converted into anatase particles with10 nm×300 nm when it was roasted at 500 ℃. The catalytic activity of10 nm×300 nm anatase particles had only 50% that of particles with10 nm×20 nm. The centers of acid on the catalyst surface made the epoxide selectivity decrease obviously. The order of the influence of solvent on epoxidation reaction:1,2 dichloroethane>butanol>cyclohexanone>methyl cyclohexane>cyclohexanol>acetic acid.

Key words: Nanometer TiO₂, Catalysis, Styrene epoxidation

CLC Number:

O643.1

TrendMD:

QI Jian-Ying, YANG Qi-Yun, LIU Zhen-Yi, KAN Jia-De, YUAN Bo, MO Wei . Styrene Epoxidation with t-Butyl Hydroperoxide Catalyzed by Nanometer TiO₂(Ⅱ)[J]. Chem. J. Chinese Universities, 2001, 22(11): 1907.

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Styrene Epoxidation with t-Butyl Hydroperoxide Catalyzed by Nanometer TiO₂(Ⅱ)

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