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Cobalt 조촉매를 첨가한 LNT 촉매의 NOx 및 PM 동시저감 특성
이경석(Kyungseok Lee),박성용(Syungyong Park),강우석(Wooseok Kang),최병철(Byungchul Choi) 한국자동차공학회 2012 한국자동차공학회 학술대회 및 전시회 Vol.2012 No.11
The purpose of this study is to investigate the performance of NOx conversion and PM(Particulate Matter) oxidation of LNT catalysts which are 2Pt20Ba/Al₂O₃, 2Pt20Ba2Co/Al₂O₃ and 2Pt20Ba5Co/Al₂O₃, respectively. The NOx conversion of 2Pt20Ba/Al₂O₃ was higher than other LNT catalysts in channel-flow condition. However, these characteristics were different from wall-flow condition, which demonstrated that the NOx conversion of 2Pt20Ba5Co/Al₂O₃ catalyst was higher than other two catalysts. PtBaCo/Al₂O₃ catalysts possessed the largest NOx storage capacity within the temperature range of 200-600℃. The existence of Co not only improved the oxidation of NO to NO2 under lean phase, but also enhanced the release and reduction of NOx during the rich phase. The oxidation of PM take placed approximately 300℃ over 2Pt20Ba/Al₂O₃. 2Pt20Ba5Co/Al₂O₃ catalysts demonstrated similar characteristics for PM oxidation which means that co-supported catalysts do not affect the oxidation reaction of PM.
DPF/LNT+DPF/SCR 복합시스템의 NOx 및 PM 동시저감 특성
이경석(Kyungseok Lee),강우석(Wooseok Kang),김화남(Hwanam Kim),최병철(Byungchul Choi) 한국자동차공학회 2012 한국자동차공학회 부문종합 학술대회 Vol.2012 No.5
The combined system of DPF/LNT+DPF/SCR(Cu-ZSM-5) catalysts in the simultaneous removal of NOx and PM(Particulate Matter) is investigated in this work. It was found that the NOx conversion of 1Pt15Ba/Al₂O₃ and 2Pt20Ba/Al₂O₃ catalyst was the highest of all LNT catalysts with respect to loading amounts of Platinum(Pt) and Barium(Ba). DPF/LNT system is the same concept such as Diesel Particulate NOx Reduction(DPNR) and in this system, the NOx conversion of wall-flow condition was lower than that of channel-flow condition since the catalytic reaction rate had been slowed due to the effect of increased SV. The DPF/LNT system released NH3 during the rich phase. Besides, the oxidation of PM take placed from 250℃ and enhanced nearly 10% in the presence of NO, NO₂ and O₂. The NOx conversion of the combined system of DPF/LNT+DPF/SCR is higher than the single system of DPF/LNT since the DPF/LNT placed upstream the DPF/SCR released NH3 and then the occurrence of the SCR reaction over DPF/SCR system.