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 04:00:00 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]

---

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), Journal Name: Journal of Catalysis; (United States) Vol. 141:1; ISSN 0021-9517; ISSN JCTLA5
• Country of Publication: United States
• Language: English

Related Subjects

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