Comparative study on the photocatalytic decomposition of methanol on TiO 2 modified by N and promoted by metals

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Abstract

The photo-induced vapor-phase reaction of methanol was investigated on Pt metals deposited on pure and N-doped TiO 2. Infrared spectroscopic measurements revealed that illumination of the CH 3OH-TiO 2 and CH 3OH-M/TiO 2 systems led to the conversion of adsorbed methoxy species into adsorbed formate. In the case of metal-promoted TiO 2 catalysts CO bonded to the metals was also detected. Pure titania exhibited very little photoactivity, its efficiency, however, increased with the narrowing of its bandgap by N-doping, a feature attributed to the prevention of electron-hole recombination. Deposition of Pt metals on pure and N-doped TiO 2 dramatically enhanced the extent of photoreaction of methanol even in visible light: hydrogen and methyl formate with selectivities of 83-90% were the major products. The most active metal was Pt followed by Pd, Ir, Rh, and Ru. The effect of metal was explained by a better separation of charge carriers induced by illumination and by enhanced electronic interaction between metal nanoparticles and TiO 2.

Original languageEnglish
Pages (from-to)199-206
Number of pages8
JournalJournal of Catalysis
Volume294
DOIs
Publication statusPublished - Oct 1 2012

Keywords

  • N-doped TiO
  • Photodecomposition of methanol
  • Pt metals deposited on TiO
  • TiO photocatalyst

ASJC Scopus subject areas

  • Catalysis
  • Physical and Theoretical Chemistry

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