Generation of active sites for CO photooxidation on TiO2 by platinum deposition

Hisahiro Einaga, Masafumi Harada, Shigeru Futamura, Takashi Ibusuki

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68 Citations (Scopus)


Photocatalytic oxidation of CO to CO2 was carried out with TiO2 and Pt/TiO2 catalysts at room temperature to investigate the effect of Pt deposition. The rate for CO photooxidation by Pt/TiO2 was higher than that by TiO2. The reaction rate increased with incident light intensity to the power of 0.7 for Pt/TiO2 and 0.5 for TiO2. The dependency of reaction rate on the concentration of CO and water vapor was explained in terms of Langmuir-Hinshelwood mechanism, where CO was more efficiently adsorbed on Pt sites compared with TiO2. On the basis of diffuse reflectance FTIR spectroscopic studies and CO photodesorption measurements, Pt on TiO2 acted as the active sites on which CO was chemically adsorbed and oxidized to CO2 on photoirradiation in the presence of O2.

Original languageEnglish
Pages (from-to)9290-9297
Number of pages8
JournalJournal of Physical Chemistry B
Issue number35
Publication statusPublished - Sep 4 2003
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Physical and Theoretical Chemistry
  • Surfaces, Coatings and Films
  • Materials Chemistry


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