Journal
CHEMCATCHEM
Volume 2, Issue 3, Pages 281-286Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/cctc.200900243
Keywords
gold; heterogeneous catalysis; hydroxylation; oxidation; supported catalysts
Categories
Funding
- National Synchrotron Light Source
- Brookhaven National Laboratory
- U.S. Department of Energy
- Office of Science
- Office of Basic Energy Sciences [DE-AC02-98CH10886]
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Gold oxide nanoparticles were prepared on the native surface and a hydroxylated surface of a nonporous TiO2 support (Degussa P25). Scanning transmission electron microscopy shows the formation of similarly sized clusters on both support materials (1.86 and 1.61 nm clusters on the native oxide and the hydroxylated oxide respectively). X-ray absorption near-edge spectroscopy and X-ray photoelectron spectroscopy clearly indicate the formation of Au3+-rich oxide nanoparticles. Despite the similar cluster sizes and oxidation states, the gold oxide clusters grown on the hydroxylated surface were at least 180 times more catalytically active for the oxidation of carbon monoxide than those grown on the native oxide surface. Thus hydroxides, which are incidentally introduced during the solution-phase synthesis of gold catalysts, appear to play a dominant, but previously largely unrecognized, role in the catalytic properties of both oxidized and metallic gold particles.
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