ISSN print edition: 0366-6352 ISSN electronic edition: 1336-9075 Registr. No.: MK SR 9/7 Published monthly

Evaluation of the Oxidizing Potential of Ru and Ru-Pt/ZrO₂ Catalysts for NO Oxidation in the Presence of C₃H₆ and O₂

A. M. Serrano-Sánchez, P. Steltenpohl, M. P. Gonzáles-Marcos, J.A.Gonzáles-Marcos, and J. R. Gonzáles-Velasco

Department of Chemical Engineering, Faculty of Sciences, University of the Basque Country/EHU. P.O. Box 644 - E-48080 Bilbao

E-mail: iqpgovej@lg.ehu.es

Received: 1 April 2003

Abstract: The behaviour of Ru and Ru-Pt catalysts supported by ZrO₂ used for NO oxidation was studied in the presence of C₃H₆ and O₂. A qualitative correlation between physicochemical properties of the catalysts and their activity and selectivity in the NO oxidation is discussed. A high NO oxidation potential of the catalysts was encountered to give NO₂, CO₂ , and H₂O as the main products. The observed activity is directly related to the catalyst Ru content as well as to the Ru-Pt interaction. The Ru catalyst prepared by impregnation was the most active and stable even though the reaction was carried out in oxidizing atmosphere. Metal-support (Ru-ZrO₂) and metalmetal (Ru-Pt) interactions were found to be responsible for Ru phase stabilization in the catalysts. Ruthenium enhances oxidation processes, as the highest content of noninteracting ruthenium leads to lower oxidation, for NO, and ignition, for C₃H₆, temperatures. Platinum presence in the catalysts enhances the CO formation which is directly related to the metal-metal interaction.

Full paper in Portable Document Format: 581a41.pdf

Chemical Papers 58 (1) 41–47 (2004)