http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
- 中文 을 입력하시려면 zhongwen을 입력하시고 space를누르시면됩니다.
- 北京 을 입력하시려면 beijing을 입력하시고 space를 누르시면 됩니다.
RISS 인기검색어
- 검색키워드
- 저자 : 서충길(ChoongKil Seo) (검색결과 2 건)
- 무료
- 기관 내 무료
- 유료
-
환원제 분사 조건 변화에 따른 LNT 촉매의 De-NOx 특성
고상철(SangChul Ko),오광철(KwangChul Oh),서충길(ChoongKil Seo),김덕진(Deokjin Kim),염경민(Kyoungmin Yeom),이춘범(Chunbeom Lee) 한국자동차공학회 2012 한국자동차공학회 부문종합 학술대회 Vol.2012 No.5
Nitrogen oxides act as a precursor to other toxic pollutants, such as nitric acid, which causes acid rain. For these reasons, they are subject to environmental regulations for motor vehicles. Lean-burn engines to meet these regulations are needed to reduce the amount of emitted nitrogen oxides. Therefore other types of catalytic converters are needed to reduce these types of emissions. One of these is the Lean NOx Trap (LNT) or NOx absorber catalytic converter. The LNT is operated periodically, by switching the engine from lean-burn operation to rich operation. The purpose of this paper is to understand the LNT catalyst characteristics with gasoline reductant. LNT catalyst used in the experiment is mounted on BMW Lean GDi vehicles. The experiment results of using LPG gas burner, this LNT catalyst is effected by the exhaust gas temperature, O₂ concentration in exhaust gas and the amount of reductant injection. This LNT catalyst, oxygen concentration of 2%, 4% and 6% of which 6% of the NOx storage capacity is higher and high NOx conversion rate at 350℃. NOx conversion characteristics vary with the cycle time and injection, the shorter lean period(15sec) when the high NOx conversion.
-
De-NOx Performance of HC-SCR System Combining Ag/Al₂O₃ and Pd/Al₂O₃ Catalysts
Kyungseok Lee(이경석),Byungchul Choi(최병철),Chunbeom Lee(이춘범),Kwangchul Oh(오광철),Choongkil Seo(서충길) 한국자동차공학회 2021 한국자동차공학회 부문종합 학술대회 Vol.2021 No.6
Recent commercial after-treatment technology for NOx abatement relies heavily on active phases by specific catalysis in a catalytic converter. Although urea-SCR is currently the leading technology for NOx reduction from diesel vehicles, this system has some drawbacks, including urea freezing, high running costs, and NH<SUB>3</SUB> slip. Thus, alternative SCR system are required to comply with upcoming emission standards. In the present study, we developed a novel concept of a combined HC-SCR system with silver (Ag)- and palladium (Pd)-based catalysts supported on γ-Al<sub>2</sub>O<SUB>3</SUB>, focusing on the enhanced low-temperature de-NOx performance, suppression of reductant slip (HC, H<SUB>2</SUB>, and CO), optimal catalytic arrangement, and effect of hydrothermal aging in the H<SUB>2</SUB>-assisted HC-SCR process. The 1Ag/Al<sub>2</sub>O<SUB>3</SUB> exhibited wide active de-NOx window for both the C<SUB>3</SUB>H<SUB>6</SUB>-SCR and H<SUB>2</SUB>-C<SUB>3</SUB>H<SUB>6</SUB>-SCR, whereas poor de-NOx activity was observed in the H<SUB>2</SUB>-SCR process. A relative high reaction temperature (> 500℃) was required to oxidize CO and C<SUB>3</SUB>H<SUB>6</SUB> completely. In contrast to stand-alone Ag/Al<sub>2</sub>O<SUB>3</SUB>, Pd/Al<sub>2</sub>O<SUB>3</SUB> could suppress CO and C<SUB>3</SUB>H<SUB>6</SUB> slip at relatively low temperatures (< 275℃) under all SCR conditions. The combined SCR system (volume ratio = 80% (Ag/Al<sub>2</sub>O<SUB>3</SUB>):20% (Pd/Al<sub>2</sub>O<SUB>3</SUB>)) allowed the simultaneous reduction of NOx, C<SUB>3</SUB>H<SUB>6</SUB>, CO, and H<SUB>2</SUB> over a wide reaction temperature.
연관 검색어 추천
이 검색어로 많이 본 자료
활용도 높은 자료
