The interactions of gold/cerium oxide with CO were studied to elucidate the activity/stability of various structures in oxygen and water. A broad absorption in the 2130-2140/cm range, more resistant to oxidation than the usual band of CO on the Au0 sites, assigned to CO interacting with cationic gold clusters, was observed. These species showed lower reactivity to oxygen than CO adsorbed on the Au0 particles, beginning to produce CO2 at ∼ 310 K, while CO adsorbed on metallic gold formed CO2 below room temperature. On both the high- and low-content gold-ceria samples, a broad CO absorption band in the range 2000-2100/cm was observed following a reduction treatment at 473 K. This is an abstract of a paper presented at the AIChE Annual Meeting (San Francisco, CA 11/12-17/2006).
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