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Issue
J. Chim. Phys.
Volume 96, Number 3, March 1999
Page(s) 437 - 442
DOI http://dx.doi.org/10.1051/jcp:1999150
DOI: 10.1051/jcp:1999150


J. Chim. Phys. Vol. 96, N°3  p. 437-442

Durability of Three-Way Platinum and Rhodium Catalysts in Oxidizing, Reducing and Cycled Environments

J.A. Botas, R. Ferret, M.A. Gutiérrez-Ortiz and J.R. González-Velasco

Departamento de Ingeniería Química, Facultad de Ciencias, Universidad del País Vasco, Euskal Herriko Unibertsitatea, P.0. Box 644, 48080 Bilbao, Spain

Abstract
The three-way catalytic behaviour (CO, HC and NO x conversions and light-off temperatures) of MN/CeO 2/Al 2O 3 (MN: Pt, Rh, Pt-Rh) catalysts, fresh and aged under severe oxidizing, reducing and cycled environments, has been analyzed. The bimetallic Pt-Rh catalyst resulted the most active among those tested.

Résumé
Le comportement catalytique (conversions de CO, HC et NO x et temperature d'ignition) de catalyseurs trois-voies MN/CeO 2/Al 2O 3 (MN : Pt, Rh, Pt-Rh) frais et vieillis sous sévère conditions en environnement oxydant, réducteur et cyclique, a été analysé. Les résultats obtenus indiquent que parmi les catalyseurs étudiés, le bi- metallique Pt-Rh est le plus actif.


Key words: TWC, three-way catalyst, thermal aging, light-off temperature
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© EDP Sciences 1999