Performance improvements resulting from the adoption of a new type CeO2-ZrO2-based material were found using a two-brick three way catalyst (TWC) system. Compared to a conventional CeO2-ZrO2-based material, this new type CeO2-ZrO2 has both a larger oxygen storage capacity and a slower oxygen release rate. Such characteristics were confirmed by fundamental studies. Vehicle evaluations showed this material was most effective for hot NOx control when used in the rear catalyst, especially after fuel cuts. The improvement in NOx was thought to be caused by the increased oxygen storage capacity (OSC), which effectively stored excess oxygen during fuel cuts. As a result, the air-to-fuel ratio (A/F) surrounding the active sites could be kept at stoichiometry even if the engine control shifted to a lean setting.


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    Titel :

    Study on New Characteristic CeO2-ZrO2 Based Material for Advanced TWC


    Weitere Titelangaben:

    Sae Technical Papers


    Beteiligte:
    Kohara, Akira (Autor:in) / Katoh, Katsuaki (Autor:in) / Yamada, Teiji (Autor:in) / Hirasawa, Yoshiro (Autor:in)

    Kongress:

    SAE World Congress & Exhibition ; 2009



    Erscheinungsdatum :

    20.04.2009




    Medientyp :

    Aufsatz (Konferenz)


    Format :

    Print


    Sprache :

    Englisch


    Schlagwörter :


    Study on new characteristic CeO2-ZrO2 based material for advanced three-way-catalysts

    Hirasawa,Y. / Katoh,K. / Yamada,T. et al. | Kraftfahrwesen | 2009


    2009-01-1078 Study on New Characteristic CeO2-ZrO2 Based Material for Advanced TWC

    Hirasawa, Y. / Katoh, K. / Yamada, T. et al. | British Library Conference Proceedings | 2009


    Advanced TWC Technologies Using CeO2/ZrO2 Solid Solutions

    Robota, H. J. / Nunan, J. G. / Williamson, W. B. | SAE Technical Papers | 1996


    New CeO2-ZrO2 mixed oxides with improved redox properties of advanced TWC catalysts

    Rohart,E. / Verdier,S. / Demourgues,A. et al. | Kraftfahrwesen | 2006


    New CeO2-ZrO2 Mixed Oxides with Improved Redox Properties for Advanced TWC Catalysts

    Baylet, A. / Demourgues, A. / Pacaud, B. et al. | SAE Technical Papers | 2006