CO adsorption and oxidation on Au/TiO2

Authors
Dekkers, MAP Lippits, MJ Nieuwenhuys, BE
Citation
Map. Dekkers et al., CO adsorption and oxidation on Au/TiO2, CATAL LETT, 56(4), 1998, pp. 195-197
Citations number
13
Categorie Soggetti
Physical Chemistry/Chemical Physics","Chemical Engineering
Journal title
CATALYSIS LETTERS
ISSN journal
1011372X → ACNP
Volume
56
Issue
4
Year of publication
1998
Pages
195 - 197
Database
ISI
SICI code
1011-372X(1998)56:4<195:CAAOOA>2.0.ZU;2-4
Abstract
Preoxidized Au/TiO2 showed no initial activity during a first heating stage up to 70 degrees C, while prereduction yielded a high initial CO conversio n at room temperature. With FTIRS, two different CO absorption bands were d etected. One band is usually attributed to CO on an oxidic gold species (21 51 cm(-1)), the other one is characteristic of CO on metallic gold (2112 cm (-1)). The presence of the first species appears to have a detrimental effe ct on the CO oxidation by O-2. The present results do not support a model i n which the activity of supported gold catalysts in CO oxidation is ascribe d to ionic Au particles.