Relationship between the zirconia-promoted reduction in the Rh-loaded Ce{sub 0.5}Zr{sub 0.5}O{sub 2} mixed oxide and the Zr-O local structure
- Universita de Trieste (Italy)
- Universita di Trieste (Italy); and others
Rh/CeO{sub 2}-ZrO{sub 2} mixed oxides show improved redox properties compared to Rh/CeO{sub 2} due to a low-temperature reduction in the bulk. In the present work we have investigated the Zr-O and Ce-O local structure in Rh/Ce{sub 0.5}Zr{sub 0.5}O{sub 2} by means of EXAFS and Raman spectroscopy. By introducing Zr{sup 4+} into the CeO{sub 2} lattice, the oxygen sublattice is strongly modified compared to the ideal fluorite structure of CeO{sub 2}: the Ce{sup 4+} ions retain their coordination while the number of oxygens around the Zr{sup 4+} decreases from 8 to 6 due to a displacement of two oxygens to a nonbonding distance. It is suggested that this distortion of the oxygen sublattice generates some mobile oxygens in Rh/Ce{sub 0.5}Zr{sub 0.5}O{sub 2} which are responsible for the improved redox properties. 23 refs., 5 figs., 1 tab.
- OSTI ID:
- 539464
- Journal Information:
- Journal of Catalysis, Journal Name: Journal of Catalysis Journal Issue: 2 Vol. 168; ISSN 0021-9517; ISSN JCTLA5
- Country of Publication:
- United States
- Language:
- English
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