Redox behavior of high-surface-area Rh-, Pt-, and Pd-loaded Ce{sub 0.5}Zr{sub 0.5}O{sub 2} mixed oxide
- Univ. di Trieste (Italy)
The temperature programmed reduction, oxygen uptake, and surface area stability of high-surface-area Rh-, Pt-, and Pd-loaded Ce{sub 0.5}Zr{sub 0.5}O{sub 2} solid solution have been investigated. It is observed that the presence of the noble metal strongly favors the reduction of the support compared with the metal-free Ce{sub 0.5}Zr{sub 0.5}O{sub 2}. A further improvement is observed on sintering induced by repetitive reduction/oxidation processes. Indeed, the temperature of support reduction decreases from 650--950 to about 450 K for the Rh- and Pt-loaded samples and to 520 K in the presence of Pd. In contrast, the low-temperature reduction of Rh/CeO{sub 2} (surface area 194 m{sup 2}/g) is strongly encumbered after such treatments. The roles of noble metal and added ZrO{sub 2} in promoting low-temperature reduction are discussed.
- OSTI ID:
- 328297
- Journal Information:
- Journal of Catalysis, Vol. 182, Issue 1; Other Information: PBD: 15 Feb 1999
- Country of Publication:
- United States
- Language:
- English
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