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.
Effect of Hydrothermal Aging over a Commercial DOC on $ NO_{2} $ Production and Subsequent SCR Efficiency
2018
Article (Journal)
English
BKL: | 55.20$jStraßenfahrzeugtechnik / 55.20 Straßenfahrzeugtechnik |
Effect of Hydrothermal Aging over a Commercial DOC on NO2 Production and Subsequent SCR Efficiency
Springer Verlag | 2018
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Tema Archive | 1980
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