Journal
JOURNAL OF PHYSICAL CHEMISTRY B
Volume 109, Issue 20, Pages 10319-10326Publisher
AMER CHEMICAL SOC
DOI: 10.1021/jp050818c
Keywords
-
Categories
Ask authors/readers for more resources
Changes in a Au/TiO2 catalyst during the activation process from an as-prepared state, consisting of supported AuOx(OH)(4-2x)(-) species, were monitored with X-ray absorption spectroscopy and FTIR spectroscopy, complemented with XPS, microcalorimetry, and TEM characterization. When the catalyst was activated with H-2 pulses at 298 K, there was an induction period when little changes were detected. This was followed by a period of increasing rate of reduction of Au3+ to Au-0, before the reduction rate decreased until the sample was fully reduced. A similar trend in the activation process was observed if CO pulses at 273 K or a steady flow of CO at about 240 K was used to activate the sample. With both activation procedures, the CO oxidation activity of the catalyst at 195 K increased with the degree of reduction up to 70% reduction, and decreased slightly beyond 80% reduction. The results were consistent with metallic An being necessary for catalytic activity.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available