Silica-Supported Gold Catalyst Modified by Doping with Titania for Cyclohexane Oxidation |
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Authors: | Li-Xin Xu Chao-Hong He Ming-Qiao Zhu Ke-Jun Wu Yu-Long Lai |
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Affiliation: | (1) Department of Chemical and Biochemical Engineering, Zhejiang University, Hangzhou, 310027, P. R. China |
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Abstract: | Amorphous silica was modified by doping with titania through a surface sol–gel process and applied as the support for depositing gold. These doped silica-supported gold catalysts were tested in the selective cyclohexane oxidation to cyclohexanone and cyclohexanol using oxygen. Under the oxidation conditions of 150 °C, 1.5 MPa and 3 h, a selectivity of 91.7% for cyclohexanone and cyclohexanol could be reached over the gold catalyst, affording a cyclohexane conversion of 8.4% and a turnover frequency up to 40,133 per hour. Moreover, the catalytic activity and selectivity could be well retained in 4 recycling oxidation reactions, showing a high stability of the gold catalyst supported on titania-doped silica. |
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Keywords: | Gold catalyst Cyclohexane oxidation Titania Silica |
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