Controlled oxygen chemisorption on an alumina supported rhodium catalyst. The formation of a new metal-metal oxide interface determined with EXAFS
1989
An alumina-supported rhodium catalyst has been studied with EXAFS. After reduction and evacuation, oxygen was admitted
at 100 and 300 K. EXAFS spectra of the catalyst after oxygen admission at 100 K indicated the beginning of oxidation.
At 300 K only a small part of the rhodium particles remained metallic and this metallic 'kernel' was partly covered with
rhodium oxide. In the rhodium metal to rhodium oxide interface the same 2.7-A Rho-0' distances are present as in the
metal-support interface. A model is presented that explains the observed formation of the rhodium metal-rhodium oxide
interface.
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