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 language | English |
|---|---|
| Pages (from-to) | 617-622 |
| Number of pages | 6 |
| Journal | Comptes Rendus Chimie |
| Volume | 7 |
| Issue number | 6-7 |
| DOIs | |
| Publication status | Published - Jun 2004 |
| Event | International Symposium on Green Chemistry - Poitiers, France Duration: 19 May 2003 → 22 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
