Role of Gold Cations in the Oxidation of Carbon Monoxide Catalyzed by Iron Oxide-Supported Gold
Recent intense interest in catalysis by supported gold has focused mainly on the oxidation of CO at low temperatures, which offers the potential for many important applications, including the purification of hydrogen for automotive fuel cells. Numerous, contradictory proposals have been made concerning the nature of the active sites in supported gold catalysts. We now present evidence from a set of complementary experimental methods characterizing Au/{alpha}-Fe{sub 2}O{sub 3} catalysts, demonstrating that cationic gold plays a crucial role in catalyzing CO oxidation at 298 K, as well as in the hydrogenation of crotonaldehyde. A series of catalysts based on a co-precipitated 5-wt% Au/Fe{sub 2}O{sub 3} precursor heat treated in different ways were compared for CO oxidation at ambient temperature. The catalysts were structurally and chemically analyzed by HREM and STEM-XEDS. A combination of EXAFS, in situ XANES, XPS, and M{umlt o}ssbauer effect spectroscopy demonstrates the important role of cationic gold in the activity of these iron oxide-supported gold catalysts.
- Research Organization:
- Brookhaven National Lab. (BNL), Upton, NY (United States). National Synchrotron Light Source
- Sponsoring Organization:
- Doe - Office Of Science
- DOE Contract Number:
- DE-AC02-98CH10886
- OSTI ID:
- 914192
- Report Number(s):
- BNL-78760-2007-JA; JCTLA5; TRN: US200804%%587
- Journal Information:
- J. Catal., Vol. 242, Issue 1; ISSN 0021-9517
- Country of Publication:
- United States
- Language:
- English
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