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Abstract:
Work on clean oxide surfaces, such as NiO, CoO, FeO, Cr2O3 and Al2O3, where adsorption and reaction of small molecules has been studied, is reviewed. The studies on the clean surfaces are the basis for investigations of transition metal particles deposited onto these oxide surfaces: Ag, Pd, Rh and Pt have been deposited on thin alumina films and the morphology has been determined via STM and SPA-LEED Photoelectron spectroscopy was applied to investigate the electronic structure of the deposits as a function of particle size. The bonding between molecules and the metal aggregates has been characterized via thermal desorption spectroscopy and x-ray absorption spectroscopy. We find a considerable variation of adsorption strength as a function of particle size and the kind of metal. Additionally, examples for size dependent reactivity are presented.
