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| - Behavior of Non-Promoted and Ceria-Promoted Pt/Rh and Pd/RhThree-Way Catalysts under Steady State and Dynamic Operation ofHybrid Vehicles
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| - The suitability of newly developed non-promoted and ceria-promoted palladium−rhodiumautomotive catalysts for the exhaust gas control of a hybrid drive system has been tested bylight-off experiments with steady and cycling feed stoichiometry, and pulsed-flow operation. Thedynamic behavior of the honeycomb-type catalysts has been compared to the performance ofstandard honeycomb platinum−rhodium catalysts. Light-off tests carried out in the range 150−500 °C indicated significant differences in the conversion of NOx, CO, and hydrocarbons duringwarm-up, depending on the catalyst composition and whether λ-cycling was applied or not.Appropriate λ-cycling substantially improved the behavior of all catalysts in the lower light-offregion. At higher temperatures cycling afforded lower conversions of all target components. Underpulsed-flow operation with an air pulse preceding the exhaust pulse (filling of the cylinder withair), asymmetric λ-cycling with longer rich half-cycles resulted in CO and HC conversions aswell as N2 yields similar to or higher than those without an air pulse for the ceria-promotedcatalysts. The catalytic tests suggest that ceria-promoted palladium is competitive to Pt−Rh−Ce in a hybrid vehicle application.
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