Lean NOx Traps are used to treat the NOx emissions from lean-burn engines by storing the NOx under lean conditions and reducing the NOx during periodic rich excursions. However, sulfur poisons the adsorption sites of the traps. The sulfur can be removed from the NOx trap by operating rich at high temperatures for several minutes. This results in the release of some SO2 but also large quantities of H2S, which is a source of customer dissatisfaction that must be reduced or eliminated. This paper describes the use of a nickel-containing catalyst and air/fuel control to maximize the release of SO2 and minimize the emissions of H2S during the desulfation of a lean NOx trap. We present laboratory and vehicle data with a nickel-containing catalyst located downstream of a lean NOx trap during desulfations of the trap. The nickel effectively reduced the emissions of H2S during the desulfation while improving the robustness to fluctuations in the air/fuel control.


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    Titel :

    H2S Suppression During the Desulfation of a Lean NOx Trap with a Nickel-Containing Catalyst


    Weitere Titelangaben:

    Sae Technical Papers


    Beteiligte:
    Surnilla, Gopichandra (Autor:in) / Theis, Joseph (Autor:in) / Ura, Justin (Autor:in) / Elwart, Shane (Autor:in)

    Kongress:

    SAE 2005 World Congress & Exhibition ; 2005



    Erscheinungsdatum :

    2005-04-11




    Medientyp :

    Aufsatz (Konferenz)


    Format :

    Print


    Sprache :

    Englisch




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    Dobson, D. A. / Meyer, G. M. / Asik, J. R. | SAE Technical Papers | 2001


    Suppression of Sulfide Emission During Lean Nox Trap Desulfation

    Asik, J. R. / Dobson, D. A. / Meyer, G. M. et al. | British Library Conference Proceedings | 2001


    2005-01-1116 H~2S Suppression During the Desulfation of a Lean NO~x Trap with a Nickel-Containing Catalyst

    Elwart, S. / Surnilla, G. / Ura, J. et al. | British Library Conference Proceedings | 2005