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[가솔린엔진] 천연가스 자동차용 삼원촉매의 공연비 윈도우 영역 개선
최병철(B.C. Choi),정필수(P.S. Jung),김대중(D.J. Kim) 한국자동차공학회 1999 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
To investigate the conversion efficiency of methane on the catalyst for natural gas vehicles(NGV), experiments through the model gas reaction to find parameter that affect the conversion ratio of methane were carried out; such as. Redox ratio. CO. NO. CO+NO. H2O. For the catalyst temperature change. the catalyst loaded with larger amount of Pd and with additive catalyst La showed lower activation temperature. Therefore. it is concluded that in order to widen the range of A -window for NGV catalyst. using the catalyst loaded with larger amount of Pd and with addtive catalyst La is advantageous.
최병철(B.C.Choi),정필수(P.S.Jung) 한국자동차공학회 2000 한국 자동차공학회논문집 Vol.8 No.1
The model gas reaction tests were carried out to investigate the purification characteristics of methane on the exclusive catalyst for NGV. The experiment was conducted with the factors which affect the conversion efficiency of methane, such as Redox ratio, coexistence components of CO, NO, H₂O, precious metals and additives. The catalyst loaded with larger amount of Pd and with additive La showed lower light-off temperature. In the presence of CO and NO, the conversion efficiency of methane was varied according to the kind of additive loaded. The conversion efficiency of methane was dropped for the catalyst loaded with La under lean air-fuel ratio, while it increased for the one loaded with Ti+Zr for the same condition. It was shown that the water vapor inhibited methane from oxidation by its poisoning on the surface of catalyst.