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International Journal of Automotive Technology > Volume 19(6); 2018 > Article
International Journal of Automotive Technology 2018;19(6): 941-947.
EFFECT OF HYDROTHERMAL AGING OVER A COMMERCIAL DOC ON NO2 PRODUCTION AND SUBSEQUENT SCR EFFICIENCY
Tae Joong Wang
Doosan Infracore
PDF Links Corresponding Author.  Tae Joong Wang , Email. taejoong.wang@doosan.com
ABSTRACT
In this study, the effect of hydrothermal aging over a commercial diesel oxidation catalyst (DOC) on deterioration in nitrogen dioxide (NO2) production activity has been experimentally investigated based on a micro-reactor DOC experiment. Through this experimental result, the NO2 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 NO2 production performance through DOC. The DOC sample hydrothermally aged for 25 h at 750 °C has displayed the lowest NO2 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 NO2 to NOx ratio due to the hydrothermal aging of DOC on the NOx removal efficiency of SCR.
Key Words: Diesel engine, Exhaust aftertreatment system, Diesel oxidation catalyst, Selective catalytic reduction, Hydrothermal aging
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