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김동현(Donghyun Kim),한재욱(Jaeuk Han),임윤택(Yuntaek Lim),김은석(Eunsuk Kim),한현식(Hyun-sik Han) 한국자동차공학회 2014 한국자동차공학회 부문종합 학술대회 Vol.2014 No.5
PM number regulations have been started from Euro-5b as well as aggressive environment regulation on vehicle emission. Therefore, It’s hard to meet both strict NOx emission and Particle Number in Euro-6 regulation. Moreover, exhaust gas temperature has been gradually decline to consider fuel efficiency engine in light duty diesel vehicle. Present DOC+DPF+SCR system will be difficult to comply with Euro-6 NOx emission on account of lower SCR inlet temperature. The temperature problems can potentially be solved by integrating the coated SCR into the DPF’s wall as one multifunctional catalysts. Basically, SCRoF has the role of Soot Filtering and NOx reduction as well as lower pressure drop. SCRoF has many advantages as follows .1.Low cost of total aftertreatment system with component reduction. 2.Improved cold start NOx reduction performance. This study focus on optimization of catalysts loading and process getting better NOx performance and Filtering rate. Vehicle test results satisfy the NOx emission and Particle Number regulation for Euro-6.
작동 온도 영역이 확장된 제올라이트계 SCR 촉매 개발
김진원(Jinwon Kim),한재욱(Jaeuk Han),임윤택(Yuntaek Lim),김은석(Eunseok Kim),한현식(Hyunsik Han) 한국자동차공학회 2014 한국자동차공학회 부문종합 학술대회 Vol.2014 No.5
Selective catalytic reduction of NOx by NH₃(NH₃-SCR) is widely applied in the treatment of NOx emissions form diesel vehicles. Zeolite-based SCR catalysts have been widely studied and used for NH3-SCR due to the high NO conversions that can be obtained in relatively wide temperature windows. This paper had been conducted to investigate the NOx reduction activity of SCR using combination of catalyst. Temperature range of catalytic activity has been changed with changing Cu status in Cu-ion exchange catalyst. Fe-ion exchange catalyst that showed good activity at high temperature. Two kinds of catalyst had combined for increasing catalytic activity at whole range. In case of Cu-C & Fe-C combination catalysts, Fe-C catalyst at front position and Cu-C at rear position system showed good activity at whole range. The best activity showed at Fe/Cu-A and Fe/Cu-B. Considering N2O formation, Cu & Fe combination catalyst had showed better performance than Cu only catalyst.