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

J.T. Carneiro, Joana T. Carneiro, A.R. Almeida, Ana R. Almeida, Jacob A. Moulijn, Guido Mul

Research output: Contribution to journalArticleAcademicpeer-review

39 Citations (Scopus)

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
Original languageEnglish
Pages (from-to)2744-2750
Number of pages7
JournalPhysical chemistry chemical physics
Volume12
Issue number11
DOIs
Publication statusPublished - 2010

Keywords

  • METIS-269155
  • IR-95317

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