Dynamic electronic structure of a Au/TiO2 catalyst under reaction conditions.
The electronic structure of a highly active Au/TiO2 powder catalyst was probed in situ by synchrotron X-ray photoelectron spectroscopy (XPS) in the 10-1 mbar range. The electronic structure of the Au component was found to respond sensitively to changes in temperature and indicated the absence of bulklike metallic Au under the conditions of highest catalytic activity. Concurrent modification of interfacial sites adjacent to Au on the TiO2 support was not evident from the Ti photoemission, but may have been below the detection limit of XPS.
Willneff
Elizabeth A
EA
Molecular Materials Centre, School of Chemistry, The University of Manchester, P.O. Box 88, Manchester, M60 1QD, UK.
Braun
Simon
S
Rosenthal
Dirk
D
Bluhm
Hendrik
H
Hävecker
Michael
M
Kleimenov
Evgenyi
E
Knop-Gericke
Axel
A
Schlögl
Robert
R
Schroeder
Sven L M
SL