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자료유형
학술대회자료
저자정보
조자윤 (한양대학교) 김영득 (한양대학교) 김우승 (한양대학교)
저널정보
한국자동차공학회 한국자동차공학회 춘계학술대회 2010 KSAE 부문 종합학술대회
발행연도
2010.5
수록면
425 - 432 (8page)

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The reduction characteristics of NO₂ to NO are studied experimentally over a platinum-based catalyst, especially at lower temperatures below about 200℃. In the exhaust gas after-treatment system for heavy-duty diesel engines, a diesel oxidation catalyst (DOC) is used as an integral component to effectively reduce engine raw emissions in combination with selective catalytic reduction (SCR) and diesel particulate filter (DPF). In detail, to improve the NOx conversion over a SCR catalyst, the DOC is usually placed upstream of the SCR catalyst to enhance the fast-SCR reaction using equimolar amounts of NO and NO₂. The DOC is also used in conjunction with a DPF, called a continuously regenerating trap (CRT), to oxidize NO for passive particulate combustion by NO₂. Thus, the characteristics of NO₂ conversion over DOC are essentially analyzed to accurately predict the performance of an aftertreatment system. In the present work, two types of steady-state experiments, engine bench and synthetic gas bench tests, are carried out in sequence. Steady-state engine bench tests with the DOC mounted on a light duty 4-cylinder 2.0 liter turbocharged diesel engine are performed and prove that CO plays a major role in NO₂ abatement at temperatures below the light-off temperature of CO oxidation, about 200 . Then, synthetic gas bench tests are performed using synthetic gas mixtures with CO, C₃H?, NO, NO₂, O₂, H₂O, and N₂ in the 140-450 T-range and show that both CO and C₃H? are capable of reducing NO₂. It is noted that the reaction rate of NO₂ with C₃H? is much higher than that with CO. At temperatures below about 200 , the reduction of NO₂ to NO is promoted with increasing CO concentration and NO₂/NOx ratio and with decreasing O₂ concentration, as well as with the presence of H₂O.

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Abstract
1. 서론
2. 실험장치 및 방법
3. 실험결과 및 고찰
4. 결론
References

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UCI(KEPA) : I410-ECN-0101-2014-550-003106656