Ethanol reactions over Au-Rh/CeO2 catalysts: total decomposition and H-2 formation

P Y Sheng, Hicham Idriss

Research output: Contribution to journalArticle

27 Citations (Scopus)

Abstract

The reaction of ethanol has been investigated on the surface of Au-Rh/CeO2 by temperature programmed desorption (TPD), infrared spectroscopy and in steady state conditions. Most of adsorbed ethanol is found in the form of ethoxides (v O-C at 1045 and 1096 cm(-1)). Heating the surface resulted in the transformation of ethoxides to carbonates (v COO at 1561 and 1347 cm(-1)) without the presence of stable acetaldehyde or formaldehyde species. By 673 K all surface species has been desorbed. The relative instability of these carbonates when compared to CeO2 or Rh/CeO2 indicates that Au is enhancing the rate of oxidation. Most of CO2 formed during TPD is resulting from carbonate decomposition. Catalytic reactions showed that both CO2 and H-2 can be formed with high yield over a wide temperature range. (C) 2004 American Vacuum Society.

Original languageEnglish
Pages (from-to)1652-1658
Number of pages7
JournalJournal of Vacuum Science & Technology. A, Vacuum, Surfaces, and Films
Volume22
Issue number4
Early online date21 Jul 2004
DOIs
Publication statusPublished - Jul 2004
Event50th AVS International Symposium - Baltimore, MD, United States
Duration: 2 Nov 20037 Nov 2003

Keywords

  • temperature-programmed desorption
  • situ FT-IR
  • carbon monoxide
  • cerium dioxide
  • co oxidation
  • gold
  • adsorption
  • surfaces
  • spectroscopy
  • reduction

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