Issue 11, 2010

Cyclohexane selective photocatalytic oxidation by anatase TiO2: influence of particle size and crystallinity

Abstract

A systematic study is presented on the effect of crystallite size of Anatase (Hombikat, Sachtleben), varied by calcination at different temperatures up to 800 °C, on photocatalytic activity in cyclohexane selective oxidation. Two different reactors were used to test the materials: a top illumination reactor and an in situ ATR-FTIR cell. Properties such as crystallinity and associated availability of holes and electrons for surface reactions, as well as the amount of surface OH-groups, are shown to have a significant influence on TiO2 activity, (surface) selectivity, and stability. Upon increasing the crystallite size, productivity (g−1catalyst) decreases, while (i) the TOF (moles of cyclohexanone formed per minute per OH-site), (ii) the rate of cyclohexanone desorption, (iii) catalytic site stability, and (iv) the cyclohexanol/cyclohexanone ratio increase. The results are discussed on the basis of a reaction scheme, and a simple reaction rate equation.

Graphical abstract: Cyclohexane selective photocatalytic oxidation by anatase TiO2: influence of particle size and crystallinity

Article information

Article type
Paper
Submitted
23 Sep 2009
Accepted
23 Dec 2009
First published
27 Jan 2010

Phys. Chem. Chem. Phys., 2010,12, 2744-2750

Cyclohexane selective photocatalytic oxidation by anatase TiO2: influence of particle size and crystallinity

J. T. Carneiro, A. R. Almeida, J. A. Moulijn and G. Mul, Phys. Chem. Chem. Phys., 2010, 12, 2744 DOI: 10.1039/B919886E

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