Abstract
N2 adsorption at 77K, TEM and Hz chemisorption. Both the oxygen storage capacity (OSC) and the activity in the '*0/160 isotopic homoexchange reaction were measured on fresh and aged-catalysts. Interestingly, Ir was found to be responsible for the largest OSC enhancement. For all catalysts, large metal particles were shown to be more reactive. Looking at oxygen activation on metal particles, Ir and Rh appear to behave differently. Ir catalysts activity in the homoexchange reaction was found to be independent on the underlying support. On the opposite, a comparison between OSC and isotopic homoexchange results evidenced a strong metaVsupport interaction in the case of Rh catalysts. 1. INTRODUCTION In the past decades, many studies have been performed in the field of environmental catalysis. Evolution towards stricter regulations on automotive pollution control implied an optimization of Three-Way Catalysts (TWC) which operate under transient conditions. One key parameter is the oxygen storage. Cerium-zirconium solid solutions were shown to be good candidates with enlarged Oxygen-Storage Capacity (OSC) and improved redox properties [l-61. However, only a few studies have been devoted to understand oxygen storage processes
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