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

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 °C, all catalysts showed complete conversion of ethanol with high selectivity towards hydrogen production (approaching the theoretical value of 6 mol of H2 per mole of ethanol inlet). The effect of the support was mainly noticed on the CO2/CO ratios. At 400 °C 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 higher the surface oxygen concentration, the higher the WGSR.

Auteur(s) : C Diagne, H Idriss, K Pearson, MA Gómez-García
Pages : 617–622
Année de publication : 2004
Revue : Comptes Rendus Chimie
N° de volume : 7, Issues 6–7
Type : Article
Mise en ligne par : DIAGNE Cheikh Talibouya