Methane and nitric oxide conversion was studied over a Pd-based catalyst at steady state conditions. The gas mixture contained methane (0.125 %), Nitric oxide (0.125 %), carbon monoxide (0.7 %), oxygen and argon as carrier gas. The experiments were performed in a well-stirred reactor (Berty reactor) which provided constant gas composition over the catalyst. Lambda scans from λ=1.01 to 0.99 and back performed by varying the oxygen content, revealed a hysteresis in both the methane conversion and the nitric oxide conversion. The temperature and presence of nitric oxide affected the hysteresis.Complementary experiments in a synthetic exhaust gas rig revealed a more pronounced hysteresis in the presence of carbon dioxide and water.An attempt to model the hysteresis effect as a function of the palladium and palladium-oxide transformations was made.The effects are expected to have a strong influence on the light-off and low temperature performance on the emission control from natural gas fuelled vehicles.


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    Titel :

    Methane and Nitric Oxide Conversion Over a Catalyst Dedicated for Natural Gas Vehicles


    Weitere Titelangaben:

    Sae Technical Papers


    Beteiligte:
    Andersson, Bengt (Autor:in) / Hansson, Maria (Autor:in) / Lunden, Martin (Autor:in) / Cruise, Neil (Autor:in)

    Kongress:

    International Fuels & Lubricants Meeting & Exposition ; 2000



    Erscheinungsdatum :

    16.10.2000




    Medientyp :

    Aufsatz (Konferenz)


    Format :

    Print


    Sprache :

    Englisch




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