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류정호(J.H.YOU),정일록(I.R. CHUNG),엄명도(M.D.EOM),김종춘(J.C.KIM),신영조(Y.J.SHIN),임철수(C.S.LIM),이호영(H.Y.LEE) 한국자동차공학회 1997 한국자동차공학회 춘 추계 학술대회 논문집 Vol.1997 No.11_1
The effects of sulfur content of diesel fuel on oxidation catalyst were investigated using from 0.2 weight % to 0.05 weight % sulfur content fuel on engine dynamometer and the characteristics of the emission reduction were tested using the prepared catalyst at various operating conditions such as T-6 mode with and without Pt/V and Pt catalysts in the exhaust system.<br/> In addition. the prepared catalytic converter was installed to a heavy-duty diesel engine and light-duty diesel vehicle. Then the emission reduction performance of Pt/V and Pt catalyst was also compared with each regulation test mode such as D-13 CVS-75 mode<br/> The emission reduction performance of Pt catalyst with respect to CO, HC, SOF and aldehyde was found to be a little bit higher than that of Pt/V catalyst, but Pt catalyst showed the innate disadvantage of causing the increase of PM due to the sulfate formation via high SO₂ conversion at high exhaust temperature especially above 500℃ in heavy-duty diesel engine.<br/> In the D-13 mode, PM reduction efficiency of Pt catalyst equipped heavy-duty diesel engine is lower than that of Pt/V catalyst caused by increasing sulfate in the high exhaust temperature but in the CVS-75 mode. Pt catalyst equipped light-duty vehicle showed higher PM reduction efficiency than that of Pt/V catalyst.<br/>
황순홍(S.H.HWANG),정일록(I.R.CHUNG),엄명도(M.D.EOM),김정춘(J.C.KIM) 한국자동차공학회 1998 한국자동차공학회 춘 추계 학술대회 논문집 Vol.1998 No.11_1
The exhaust emission from gasoline vehicles by long term use can accelerate the urban air pollution due to their mechanical worn-out and malfunction of emission-related parts. In this study, we tried to present the necessary basic data to prolong the emission warranty periods to the level of advanced countries by evaluating the effects of emission status and emission-related parts on the exhaust emission for the gasoline vehicles produced after 1990. In order to survey the emission status for in-use vehicles, exhaust emission was measured by CVS-75 mode according to model year, vehicle type and mileage for total 37 fleets. In addition, the measured data for 259 gasoline vehicles was analyzed.<br/>
류정호(J.H.You),김태승(T.S.Kim),정일록(I.R.Chung),임철수(C.S.Lim),최용택(Y.T.Choi),유관식(K.S.Yoo) 한국자동차공학회 1998 한국자동차공학회 춘 추계 학술대회 논문집 Vol.1998 No.11_1
Several Pt-based oxidation catalyst were prepared with different methods of preparing the metal precursor solution and characterized its Pt metal size with H2 chemisorption and TEM. To evaluate the catalytic activity, the model-gas tests were performed using micro-reactor system and on-line analyzer. In addition, a prototype of diesel oxidation catalyst were made for light-duty diesel passenger car, and tested the emission reduction performance with Korean regulation test mode (CVS-75 mode) using Chassis dynamometer.<br/>
류정호(J.H.You),엄명도(M.D.Eom),김태승(T.S.Kim),임철수(C.S.Lim),정일록(I.R.Chung) 한국자동차공학회 1999 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
Diesel engines which emit a lot of PM and NOx have been known as a main air polluter. In order to reduce the exhaust emission from diesel engines, it is necessary to prepare a comprehensive management plan for emissions from diesel vehicles. Development strategies for low emission diesel vehicles was studied and emission reduction characteristics for s ∞ t, PM and HAP were evaluated. In addition, the emission characteristics according to particle size as well as aftertreatment equipments were an 허 yzed. Performance tests have been carried out for 9 diesel aftertreatment equipments. which are supplied domestically /intemationally an ψ or are under development. In the case of DPF, more than 89% of soot and 70% of PM were removed and plasma system was shown to remove 61% of soot and 36% of PM. In the case of diesel oxidation catalysts, removal efficiency for CO and THC was over 50%, but about 10% for PM