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정종우(J.W. Jeong),김형남(H.N. Kim),윤정우(J.W. Yun),임하균(H.K. Lim),최병철(B.C. Choi) 한국자동차공학회 2001 한국자동차공학회 지부 학술대회 논문집 Vol.- No.-
The study was investigated to measure the concentration of NOx with a small gas sample using a chromatography equipped with a flame ionization detector(FID). This method was used the reacting NOx with alcohol, which NOx is converted to nitrous acid with carbon atoms by esters. The chemiluminescence analysis(CLA) is currently reliable method to measure NOx. However, CLA method is not usable to detect small quantities of NOx gases in a combustion chamber of an automotive engine as well as using in small laboratory. So we used GC with FID which is more sensitive than thermal conductive detecter(TCD) to resolve this problem. NOx(NO+NO₂) are reacted with alcohol at first and converted into nitrous acid containing organic carbon atoms by esters. Then converted nitrous acids are detectable at a chromatography with FID to the concentration of NOx.<br/>
공연비 변화에 따른 천연가스 자동차용 촉매의 정화 특성
최병철(B.C.Choi),정종우(J.W.Jeong),임명택(M.T.Lim),김영길(Y.K.Kim) 한국자동차공학회 1997 한국자동차공학회 춘 추계 학술대회 논문집 Vol.1997 No.11_2
In this study. purification chracteristics has been investigated on the catalystic reaction of methane from the simulated natural gas vehicle (NGV) exhaust on a palladium catalysat. Parameters that effect the catalytic reaction of methane considered were exhaust gas components such as O₂. NO. CO. H₂O. Two kinds of Pd catalyst used were different from additives. The conversion efficiency of methane in the three-way catalysts was sharply reduced in the range of redox ratio from 1.0 to 0.7. It was found that CH₄ was oxidized by O₂ in the lean region and by a simultaneous reaction at NO and O₂ in the rich region. At a higher concentration of H₂O. the mehtane conversion efficiency was rapidly reduced in the range of redox ratio from 1.5 to 1.2.
서충길(C. K. Seo),김화남(H. N. kim),최병철(B. C. Choi),정종우(J. W. Jeong) 한국동력기계공학회 2009 한국동력기계공학회 학술대회 논문집 Vol.2009 No.6
Selective catalytic reduction using urea is a powerful technique to reduce nitrogen oxides(NOx) emitted from diesel engines. However, it has a problems where NOx conversion efficiency is low at low temperature region with non-precious metal catalyst as zeolite. The purpose of this study is to understand fundamental characteristics of LNT(Lean NOx Trap) and SCR(Selective Catalytic Reduction) catalysts to improve NOx conversion efficiency and wide window width using LNT+SCR combination system. It was found that LNT Catalyst had much NOx storage capacity at 350°C condition than that at 200°C. NOx conversion efficiency of SCR catalyst was decremented about 5% with H<sub>2</sub>O 5% condition below temperature of 450°C. Hydrogen as a reductant which was used at LNT contributed NOx reduction, and this process formed NH<sub>3</sub> that is useful reductant for the SCR system. LNT+SCR combination system without additional injection was improved NOx reduction about 10-30% at temperature region below 400°C.