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The effect of the addition of CeO2 or La2O3 on the surface properties and catalytic behaviors of Al2O3-supported Pd catalysts was studied in the steam reforming of methane. The FTIR spectroscopy of adsorbed CO and the Pd dispersion suggest the partial coverage of Pd0 by ceria or lanthana species. This could lead to the formation of an adduct MPdxO (M = Ce or La) at the surface of the metal crystallites...