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Abstract
Ceria, platinum, and platinum-ceria catalysts supported on γ-alumina have been characterized by temperature-programmed reduction (TPR) using CO as reducing agent. In all cases, CO disproportionation was found to be negligible. Nevertheless, a small CO 2 TPR signal was detected on the γ-alumina support at tempratures higher than 673 K, and has been attributed to the water-gas shift reaction between gaseous CO and the hydroxyl groups of the alumina surface. The comparison between the CO-TPR spectra of CeO 2/Al 2O 3 and Pt-CeO 2/Al 2O 3 has revealed that platinum induces a downscale shift on the temperature of the ceria reduction peak. Two possible interpretations of this platinum-ceria interaction are proposed: (i) a CO bond weakening when CO is adsorbed on platinum particles and (ii) a decrease of the CeO bond strength for ceria localized near platinum.
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