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 language | English |
|---|---|
| Pages (from-to) | 1652-1658 |
| Number of pages | 7 |
| Journal | Journal of Vacuum Science & Technology. A, Vacuum, Surfaces, and Films |
| Volume | 22 |
| Issue number | 4 |
| Early online date | 21 Jul 2004 |
| DOIs | |
| Publication status | Published - Jul 2004 |
| Event | 50th AVS International Symposium - Baltimore, MD, United States Duration: 2 Nov 2003 → 7 Nov 2003 |
Keywords
- temperature-programmed desorption
- situ FT-IR
- carbon monoxide
- cerium dioxide
- co oxidation
- gold
- adsorption
- surfaces
- spectroscopy
- reduction