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플라즈마와 촉매를 이용한 디젤엔진 배출가수중이 NOx 저감 및 플라즈마 시뮬레이션을 통한 플라즈마 반응의 부산물 예측
전광민(Kwang Min Chun),전배혁(Bae-Hyeock Chun),박광서(Kwang-Seo Park),이형상(Hyeong-Sang Lee),류재홍(Jae Hong Ryu) 한국자동차공학회 2001 한국자동차공학회 Workshop Vol.2001 No.-
NOx reduction by a plasma/catalyst system was tested with modeled gas and diesel exhaust gas. Ag/Al₂O₃was used as the catalyst. The oxidation of NO to N0₂by the plasma was increased as HC concentration and input energy density increased. The presence of H₂O in the reactant gas led to the production of acid by plasma. The catalytic activity for NOx reduction was enhanced by the assistance of plasma especially in the lower temperature region. The NOx conversion to N₂ was evaluated by a gas chromatography in the model gas with helium as the balance gas. The result in helium balance gas showed that the selectivity to N₂ depended on the catalyst temperature and was also enhanced by the assistance of plasma. The 50% of NOx removal from the diesel exhaust gas was achieved by the plasma/catalyst system. A kinetic simulation model was also developed to characterize the plasma chemistry in modeled gas. The model uses ELENDIF program to solve Boltzmann equation for electron energy distribution function, and CHEMKIN-II program to solve stiff ODE(ordinary differential equation) problems for species concentrations. The corona discharge energy per voltage pulse and the time-space averaged EIN were obtained by fitting the model to experimental data. The model calculation shows good agreement for NO and N0₂ concentrations with the experimental data, and predicts the formation of byproducts such as CH₂O, CH₃HCO, CO and CH₃N0₂.