High-pressure study on the adsorption and oxidation of CO on gold/titania model catalysts |
| |
Authors: | Thomas Diemant Zhong Zhao Joachim Bansmann |
| |
Affiliation: | a Institut für Oberflächenchemie und Katalyse, Universität Ulm, D-89069 Ulm, Germany b Institute for Health and Consumer Protection, European Commission, Joint Research Centre, I-21020 Ispra, Italy |
| |
Abstract: | The results of an IR study on the interaction of CO/O2 gas mixtures with planar Au/TiO2 model catalysts at elevated pressures and at room temperature are presented. The model catalysts were prepared by deposition of a flat titania film on a Ru(0 0 0 1) substrate and subsequent evaporation of gold on the titania film. In the presence of the gas mixtures, an IR band in the CO stretching region was formed, pointing to linearly adsorbed CO. The position of this band is nearly independent of the Au coverage employed. Compared to pure CO, the IR band is shifted to higher wave numbers when CO/O2 gas mixtures are used. Although the production of CO2 was detected in the CO oxidation reaction on the model catalysts, the formation of other IR bands, revealing the build-up of carbonates or other side-products which is usually observed for Au/TiO2 real powder catalysts, was very weak. |
| |
Keywords: | Infrared absorption spectroscopy Catalysis Chemisorption Gold Titanium oxide Carbon monoxide Oxygen |
本文献已被 ScienceDirect 等数据库收录! |
|