Redox behavior of high surface area Rh-loaded Ce{sub 0.5}Zr{sub 0.5}O{sub 2} mixed oxide

Journal Article · Tue Apr 15 04:00:00 EDT 1997 · Journal of Catalysis

DOI:https://doi.org/10.1006/jcat.1997.1593· OSTI ID:563495

Fornasiero, P; Kaspar, J; Graziani, M ^[1]

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1. Universita de Trieste (Italy)

Cerium oxide is widely employed as a promoter in the automotive three-way catalysts (TWCs) due to its high oxygen storage/release capacity (OSC). The OSC acts as an oxygen pressure regulator in the converter which allows one to maintain a high efficiency for the TWC. This has stimulated a strong interest in the investigation of redox properties of CeO{sub 2}-based catalysts. Recently, the authors disclosed that a Ce{sub 0.5}Zr{sub 0.5}O{sub 2} mixed oxide with a surface area of 64 m{sup 2} g{sup -1} showed an unusual improvement of the redox behavior upon sintering induced by a repetitive reduction/oxidation of the solid solution. In the present paper, the redox behavior of the above Rh-loaded Ce{sub 0.5}Zr{sub 0.5}O{sub 2} is reported. The influence of the thermal/redox treatment on the H{sub 2} chemisorption is also addressed. Data obtained on a Rh/CeO{sub 2} catalyst are included to elucidate the role of ZrO{sub 2}. 16 refs., 2 figs., 3 tabs.

• OSTI ID: 563495
• Journal Information: Journal of Catalysis, Journal Name: Journal of Catalysis Journal Issue: 2 Vol. 167; ISSN 0021-9517; ISSN JCTLA5
• Country of Publication: United States
• Language: English

Related Subjects

33 ADVANCED PROPULSION SYSTEMS
40 CHEMISTRY
CATALYSTS
CERIUM OXIDES
OXIDATION
REDUCTION
RHODIUM
ZIRCONIUM OXIDES