Reactivity of Pt/Al[sub 2]O[sub 3] and Pt-CeO[sub 2]/Al[sub 2]O[sub 3] catalysts for the oxidation of carbon monoxide by oxygen

Journal Article · Sat May 01 00:00:00 EDT 1993 · Journal of Catalysis; (United States)

DOI:https://doi.org/10.1006/jcat.1993.1113· OSTI ID:6251335

Serre, C; Belot, G ^[1]; Garin, F; Maire, G ^[2]

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1. Peugeot S.A./E.R., Columbus (France)
2. CNRS, Strasbourg (France)

Ceria, platinum, and platinum-ceria catalysts supported on [gamma]-alumina have been characterized by temperature-programmed reduction (TPR) using CO as reducing agent. In all cases, CO disproportionation was found to be negligible. Nevertheless, a small CO[sub 2] TPR signal was detected on the [gamma]-alumina support at temperatures higher than 673 K, and has been attributed to the water-gas shift reaction between gaseous CO and the hydroxyl groups of the alumina surface. The comparison between the CO-TPR spectra of CeO[sub 2]/Al[sub 2]O[sub 3] and Pt-CeO[sub 2]/Al[sub 2]O[sub 3] has revealed that platinum induces a downscale shift on the temperature of the ceria reduction peak. Two possible interpretations of this platinum-ceria interaction are proposed: (i) a C-O bond weakening when CO is absorbed on platinum particles and (ii) a decrease of the Ce-O bond strength for ceria localized near platinum. 18 refs., 6 figs., 1 tab.

• OSTI ID: 6251335
• Journal Information: Journal of Catalysis; (United States), Vol. 141:1; ISSN 0021-9517
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC
ORGANIC
PHYSICAL AND ANALYTICAL CHEMISTRY
01 COAL, LIGNITE, AND PEAT
ALUMINIUM OXIDES
CATALYTIC EFFECTS
CARBON MONOXIDE
OXIDATION
CERIUM OXIDES
PLATINUM COMPOUNDS
CATALYST SUPPORTS
CATALYSTS
HETEROGENEOUS CATALYSIS
OXYGEN
PARTICLES
REDUCTION
SPECTRA
TEMPERATURE DEPENDENCE
TEMPERATURE RANGE 0273-0400 K
TEMPERATURE RANGE 0400-1000 K
WATER GAS
ALUMINIUM COMPOUNDS
CARBON COMPOUNDS
CARBON OXIDES
CATALYSIS
CERIUM COMPOUNDS
CHALCOGENIDES
CHEMICAL REACTIONS
ELEMENTS
FLUIDS
FUEL GAS
FUELS
GAS FUELS
GASES
INTERMEDIATE BTU GAS
NONMETALS
OXIDES
OXYGEN COMPOUNDS
RARE EARTH COMPOUNDS
TEMPERATURE RANGE
TRANSITION ELEMENT COMPOUNDS
400201* - Chemical & Physicochemical Properties
010408 - Coal
Lignite
& Peat- C1 Processes- (1987-)