Palladium-rhodium three-way catalysts (Pd/Rh TWCs) demonstrate the most versatile capability in achieving California LEV/ULEV emission standards for various applications ranging from thermally severe high-temperature close-coupled locations to thermally limited cooler underfloor environments. Engine aged dual-brick converters consisting of front Pd catalysts followed by rear Pd/Rh TWCs met ULEV emission standards for a high-temperature close-coupled 4.3L medium-duty truck and LEV standards for a much cooler underfloor 3. IL passenger car location, as well as intermediate environments experienced by a 3.8L vehicle. The Pd + Pd/Rh TWC systems have performance advantages and are more cost effective compared to Pd-only or trimetal (Pt/Pd/Rh) systems. For thermally limited systems such as the 3. IL system, addition of air to the Pd + Pd/Rh system was necessary. Advanced washcoat technologies incorporating stabilized ceria-zirconia promoters demonstrated advantages over earlier generations and alleviate thermal durability concerns of close coupled applications. As a result, passive catalyst only systems can achieve these low emission requirements when sufficient heat is available.


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    Titel :

    Palladium-Rhodium Catalyst Strategies for LEV Emission Applications


    Weitere Titelangaben:

    Sae Technical Papers


    Beteiligte:
    Starin, G. L. (Autor:in) / Denison, G. W. (Autor:in) / Robota, H. J. (Autor:in) / Williamson, W.B. (Autor:in)

    Kongress:

    International Fuels & Lubricants Meeting & Exposition ; 1997



    Erscheinungsdatum :

    1997-10-01




    Medientyp :

    Aufsatz (Konferenz)


    Format :

    Print


    Sprache :

    Englisch




    Palladium-Rhodium catalyst strategies for LEV emission applications

    Williamson,W.B. / Denison,G.W. / Starin,G.L. et al. | Kraftfahrwesen | 1997


    Palladium-Rhodium Catalyst Strategies for LEV Emission Applications

    Williamson, W. B. / Denison, G. W. / Starin, G. L. et al. | British Library Conference Proceedings | 1997


    Palladium and Platinum/Rhodium Dual-Catalyst Emission Solutions for Close-Coupled or Underfloor Applications

    Linden, D. G. / Ball, D. J. / Robota, H. J. et al. | SAE Technical Papers | 2000



    Palladium and Platinum/Rhodium Dual-Catalyst Emission Solutions for Close-Coupled or Underfloor Applications

    Williamson, W. B. / Ball, D. J. / Linden, D. G. et al. | British Library Conference Proceedings | 2000