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