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
Externally publishedYes

Fingerprint

Composite films
Methanol
methyl alcohol
Thin films
Oxidation
oxidation
composite materials
thin films
Carbon Monoxide
Reaction intermediates
reaction intermediates
Photocatalysis
Mass spectrometers
high vacuum
Platinum
formaldehyde
Formaldehyde
mass spectrometers
Hydrogen
Casting

Keywords

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

ASJC Scopus subject areas

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

Cite this

Real-time investigation on photocatalytic oxidation of gaseous methanol with nanocrystalline WO 3-TiO 2 composite films. / Sadale, Shivaji B.; Noda, Kei; Kobayashi, Kei; Yamada, Hirofumi; Matsushige, Kazumi.

In: Thin Solid Films, Vol. 520, No. 10, 01.03.2012, p. 3847-3851.

Research output: Contribution to journalArticle

Sadale, Shivaji B. ; Noda, Kei ; Kobayashi, Kei ; Yamada, Hirofumi ; Matsushige, Kazumi. / Real-time investigation on photocatalytic oxidation of gaseous methanol with nanocrystalline WO 3-TiO 2 composite films. In: Thin Solid Films. 2012 ; Vol. 520, No. 10. pp. 3847-3851.
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