Abstract In this study, the effect of hydrothermal aging over a commercial diesel oxidation catalyst (DOC) on deterioration in nitrogen dioxide ($ NO_{2} $) production activity has been experimentally investigated based on a micro-reactor DOC experiment. Through this experimental result, the $ NO_{2} $ to nitrogen oxides (NOx) ratio at DOC outlet has been mathematically expressed as a function of DOC temperature according to various aging conditions. The current study reveals that the catalyst aging temperature is a more dominant factor than the aging duration in terms of the decrease in $ NO_{2} $ production performance through DOC. The DOC sample hydrothermally aged for 25 h at 750 °C has displayed the lowest $ NO_{2} $ to NOx ratio compared to the samples aged for 25 ~ 100 h at 650 °C. Also, in this study, the impact of hydrothermal aging of a DOC on the selective catalytic reduction (SCR) efficiency in a ‘DOC + SCR’ aftertreatment system was predicted by using transient SCR simulations. To validate the SCR simulation, this study has conducted a dynamometer test of a non-road heavy-duty diesel engine with employing a commercial ‘DOC + SCR’ system on the exhaust line. The current study has quantitatively estimated the effect of the variation in $ NO_{2} $ to NOx ratio due to the hydrothermal aging of DOC on the NOx removal efficiency of SCR.


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    Title :

    Effect of Hydrothermal Aging over a Commercial DOC on $ NO_{2} $ Production and Subsequent SCR Efficiency


    Contributors:


    Publication date :

    2018




    Type of media :

    Article (Journal)


    Type of material :

    Print


    Language :

    English


    Classification :

    BKL:    55.20$jStraßenfahrzeugtechnik / 55.20 Straßenfahrzeugtechnik