With the ever-increasing stringency of emissions regulations, automotive three-way catalysts (TWCs) require much faster light-off performance and higher warmed-up activity than before. Most automotive manufacturers are considering the adoption of close-coupled catalyst systems as a means of dealing with cold start emissions and need the catalyst to have improved thermal durability. It is still generally true that Pd-based catalyst is suitable for close-coupled application.In this paper, an advanced Pd/Rh is reported to be improved for both cold start and hot emissions. Pd based catalyst has been an excellent catalyst for removing THC and CO at light-off but is weak in NOx. In order to elevate the NOx activity of Pd-based catalyst, Rh has been combined into the catalyst system. The Pd-Rh, Pd-OSC and Rh-OSC interactions were found to be important for the improvement of light-off and warmed-up activities on Pd/Rh catalyst. Minimizing Pd-Rh interaction was effective for Pd/Rh catalyst performances. Selections of supporting materials for both Pd and Rh are a key for improvement of light-off and warmed-up activities. By combining the above concepts, the advanced Pd/Rh, which was significantly superior to the current Pd/Rh under engine dynamometer and vehicle close-coupled test condition, was developed.


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    Title :

    Development of Advanced Pd/Rh Automotive Catalyst


    Additional title:

    Sae Technical Papers


    Contributors:
    Zhang, G. (author) / Muraki, H. (author) / Nagashima, K. (author)

    Conference:

    SIAT 2004 ; 2004



    Publication date :

    2004-01-16




    Type of media :

    Conference paper


    Type of material :

    Print


    Language :

    English




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