Abstract
The performance of a series of single noble metal automobile emission catalysts was determined as a function of washcoat composition and aging conditions. The use of catalysts containing individual noble metals allowed the contributions of each type of noble metal to be identified, and revealed the role of the alumina supports containing cerium. Each noble metal was found to have a washcoat which optimized its performance under a given set of conditions. Addition of Ce to Pt and Pd-only catalysts improved performance after aging, but Ce did not improve Rh performance at 450 °C. The individual contributions of Pt, Pd, and Rh for aged three-way performance indicate significant advantages of using Pd-Ce over Pt-Ce, however when they are combined the predominant contribution to TWC activity comes from Rh. The influence of CO concentration in the feedstream on the light-off activity was determined for single noble metal catalysts on an alumina/ceria washcoat. Increasing the CO content of the feedstream led to an increase in light-off temperature for all three noble metal catalysts. The light-off characteristics varied with the noble metal, and are thought to be related to the stability of the noble metal oxides.
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