The understanding of deactivation mechanisms is critical to the development of NOx adsorber catalysts with improved durability. The thermal deactivation of a state-of-the-art Pt/Rh based NOx adsorber catalyst is evaluated following oven agings at 800 and 900°C. Sulfur poisoning during lean/rich cycling is studied as a function of catalyst inlet temperature and SO2 concentration. Complementing these studies utilizing synthetic exhaust gas compositions, deactivation resulting from three different engine aging schedules is examined.The performance of engine-aged catalysts is evaluated as received, and following desulfurization procedures differing in inlet temperature and air/fuel ratio. The impact of aging schedules on NOx adsorption and three-way catalyst function is discussed with respect to precious metal dispersion, washcoat sintering, as well as sulfur build-up and oil-derived poisonings.


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    Titel :

    Investigation of NOx Adsorber Catalyst Deactivation


    Weitere Titelangaben:

    Sae Technical Papers


    Beteiligte:
    Dou, Danan (Autor:in) / Bailey, Owen H. (Autor:in)

    Kongress:

    International Fall Fuels and Lubricants Meeting and Exposition ; 1998



    Erscheinungsdatum :

    19.10.1998




    Medientyp :

    Aufsatz (Konferenz)


    Format :

    Print


    Sprache :

    Englisch




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