Efficient hydrogen production by ethanol reforming over Rh catalysts: Effect of addition of Zr on CeO2 for the oxidation of CO to CO2

C Diagne, Hicham Idriss, Kenji Pearson, M A Gomez-Garcia, A Kiennemann

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Abstract

Reforming of ethanol in excess of water (1 to 8 molar ratio) has been investigated on Rh/CeO2, Rh/ZrO2 and a series of Rh/CeO2-ZrO2 (with Ce/Zr = 4, 2, and 1). XPS results indicate that the presence of Rh has resulted in partial reduction not only of CeO2 but also of ZrO2 (where the presence of XPS Zr2+ lines were seen at 180.8 +/- 0.15 eV). At the temperature range of 400-500 degreesC. all catalysts showed complete conversion of ethanol with high selectivity towards hydrogen production (approaching the theoretical value of 6 mol of H-2 per mole of ethanol inlet). The effect of the support was mainly noticed on the CO2/CO ratios. At 400 degreesC and above, this ratio was thermodynamically limited for the most active catalysts. For the series Rh/CeO2-ZrO2, there appears to be a relationship between the total surface oxygen atoms (as determined by XPS) and the extent of water gas shift reaction (WGSR): the hi.-her the surface oxygen concentration, the higher the WGSR. (C) 2004 Academie des sciences. Published by Elsevier SAS. All rights reserved.

Original languageEnglish
Pages (from-to)617-622
Number of pages6
JournalComptes Rendus Chimie
Volume7
Issue number6-7
DOIs
Publication statusPublished - Jun 2004
EventInternational Symposium on Green Chemistry - Poitiers, France
Duration: 19 May 200322 May 2003

Keywords

  • Rh/CeO2
  • Rh/ZrO2
  • Rh/CeO2-ZrO2
  • H-2 production
  • ethanol reforming
  • methane reforming
  • water-gas shift reaction (WGSR)
  • gas-shift reaction
  • mixed oxides
  • surfaces

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