Desulfation characteristics of several model and fully-formulated monolithic lean NOx trap materials were studied in a laboratory flow reactor employing a chemical ionization mass spectrometer. For all samples, desulfation at elevated temperatures under reducing conditions resulted in appearance of sulfur dioxide (SO2) followed by carbonyl sulfide (COS) and hydrogen sulfide (H2S). The data appear consistent with a desulfation mechanism involving elimination of SO2 from stored sulfates under reducing conditions, followed by reaction of the SO2 with CO and H2 to produce COS and H2S, respectively. Based on these observations, several cyclic and multistage desulfation strategies were devised which greatly decreased H2S emissions while achieving relatively rapid and complete sulfur removal.


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    Title :

    Laboratory Study of Lean NOx Trap Desulfation Strategies


    Additional title:

    Sae Technical Papers



    Conference:

    SAE 2005 World Congress & Exhibition ; 2005



    Publication date :

    2005-04-11




    Type of media :

    Conference paper


    Type of material :

    Print


    Language :

    English




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