Real-time investigation on photocatalytic oxidation of gaseous methanol with nanocrystalline WO 3-TiO 2 composite films

Shivaji B. Sadale, Kei Noda, Kei Kobayashi, Hirofumi Yamada, Kazumi Matsushige

Research output: Contribution to journalArticle

5 Citations (Scopus)

Abstract

Here we report on our investigation on photocatalytic oxidation (PCO) of gaseous methanol with WO 3-TiO 2 composite films. WO 3 and WO 3-TiO 2 composite thin films were prepared by drop casting method. PCO of gaseous methanol and hydrogen generation process on platinum loaded WO 3-TiO 2 composite thin films in high vacuum were investigated using a home-made reactor with a six-channel quadrupole mass spectrometer at real-time scale under UVA (300-400 nm) light illumination. In the case of Pt loaded WO 3 thin films, PCO of gaseous methanol proceeds through intermediates viz. formaldehyde, CO and finally to CO 2 and H 2. PCO of gaseous methanol occurs via direct hole transfer over Pt loaded WO 3 thin films. On the other hand, PCO of gaseous methanol over Pt loaded WO 3-TiO 2 composite thin films proceeds with competitive direct and indirect hole transfer reactions. Our real-time analysis of gas phase photocatalysis realized the identification of direct and indirect hole transfer processes and the reaction intermediates thereof.

Original languageEnglish
Pages (from-to)3847-3851
Number of pages5
JournalThin Solid Films
Volume520
Issue number10
DOIs
Publication statusPublished - 2012 Mar 1

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Keywords

  • Direct/indirect hole transfer
  • Gas phase photocatalysis
  • Methanol decomposition
  • Titanium dioxide
  • Tungsten trioxide

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Surfaces and Interfaces
  • Surfaces, Coatings and Films
  • Metals and Alloys
  • Materials Chemistry

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