Surface and Interface Analysis · 1990 · 99 citations · 14 references
Natural SciencesChemistryMaterials ScienceInorganic ChemistryMaterials ChemistrySurface ScienceCatalyst CharacterizationCatalyst StabilityCatalytic MaterialsMetal OxidesSupported CatalystsX-ray Photoelectron SpectroscopyMetal Oxide CatalystsMetal Oxide NanocatalystsMetal Oxide SupportsStabilizationStrong Metal-support InteractionSupported Metal Oxide CatalystsSurface Oxidation StatesX-ray Absorption Spectroscopy
Abstract TiO 2 and CeO 2 are will known for inducing strong metal‐support interactions J(SMSI) of a different nature when used as supports for Pt catalysts. X‐ray photoelectron spectroscopy analysis of mixtures of TiO 2 CeO 2 oxide supports (80:20 and 20:80) reveals at the surface a remarkable stabilization of cerium in the +3 oxidation state; the stabilization is more pronounced with lower cerium oxide concentration. X‐ray absorption spectroscopy measurements done on the L III edge show the same variation as a function of cerium oxide concentration, but in the bulk the reduction is much lower. Cerium in Pt/TiO 2 CeO 2 catalysts exhibits the same behaviour.
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