期刊
CATALYSIS TODAY
卷 143, 期 3-4, 页码 326-333出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.cattod.2008.09.025
关键词
Photocatalysis; Selective photo-oxidation; Cyclohexane; Cyclohexanone; TiO2; Anatase; Surface modification; Surface acidity; Zr; ATR; Infrared
资金
- Spanish Science and Technology Foundation (FECYT)
- Ministerio de Ciencia e Innovacion
- NWO/STW
Anatase-structured Ti1-xZrxO2 materials with x = 0.00, 0.01 and 0.06, were prepared by a reverse microemulsion method, characterized, and tested as catalysts for the selective photo-oxidation of cyclohexane to cyclohexanone. In situ ATR-FTIR spectroscopy was used to evaluate the reaction. Zr incorporation into the anatase lattice enhances the surface acidity of TiO2 without causing any significant structural or electronic modification. As expected, also the stability of surface adsorbed water, i.e. the hydrophilicity, was enhanced. The increase in the Bronsted acidity, together with the higher hydrophilicity, is shown to be detrimental for performance (selectivity and stability) in the selective photo-oxidation of cyclohexane. Apparently potential intrinsic catalytic advantages of having higher acidity are outweighed by (i) the enhanced number of water born OH center dot radicals, inducing non-selective reactions, and (ii) enhanced hydrophilicity leading to slow desorption and consecutive oxidation of cyclohexanone. (C) 2008 Elsevier B.V. All rights reserved.
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