Characterization of photoreduced Pt/TiO 2 and decomposition of dichloroacetic acid over photoreduced Pt/TiO 2 catalysts

J. C. Yang, Y. C. Kim, Y. G. Shul, C. H. Shin, T. K. Lee

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Abstract

The effect of photoreduction on the properties of Pt/TiO 2 catalysts was investigated. A decrease of the white-line area in the XANES spectra of Pt/TiO 2 catalysts at the Pt L III edge was observed with increasing photoreduction time, which denoted the photoreduction of Pt/TiO 2 with UV illumination. From the EXAFS fitting results, the growth of Pt particles with the photoreduction time could be monitored. The XPS spectra of Pt/TiO 2 catalysts at the Pt4f 5/2 and Pt4f 7/2 bands showed the presence of Pt 0 and Pt 2+ states after photoreduction and the fraction of metallic Pt 0 was increased with increasing photoreduction time. The optimum photoreduction time for DCA (dichloroacetic acid) decomposition was 6 h. The partially reduced state of Pt seems to be effective to obtain a high quantum yield in DCA decomposition with minimizing the agglomeration of Pt clusters on the TiO 2 surface.

Original languageEnglish
Pages (from-to)525-529
Number of pages5
JournalApplied Surface Science
Volume121-122
DOIs
Publication statusPublished - 1997 Nov

All Science Journal Classification (ASJC) codes

  • Chemistry(all)
  • Condensed Matter Physics
  • Physics and Astronomy(all)
  • Surfaces and Interfaces
  • Surfaces, Coatings and Films

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