Journal of Environmental Science International (한국환경과학회지)

The Korean Environmental Sciences Society (한국환경과학회)
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Characteristics of N2O Emission Factor and Measurements from Gasoline-Powered Passenger Vehicles

국내휘발유 승용차량으로부터의 N2O배출인자 특성연구

  • Kim, Deug-Soo (Department of Environmental Engineering, Kunsan National University) ;
  • Ryu, Jeong-Ho (Motor Vehicle Emission Research Laboratory National Institute of Environmental Research) ;
  • Yoo, Young-Sook (Motor Vehicle Emission Research Laboratory National Institute of Environmental Research) ;
  • Jung, Sung-Woon (Motor Vehicle Emission Research Laboratory National Institute of Environmental Research) ;
  • Kim, Dae-Wook (Motor Vehicle Emission Research Laboratory National Institute of Environmental Research)
  • 김득수 (군산대학교 환경공학과) ;
  • 류정호 (국립환경과학원 교통환경연구소) ;
  • 유영숙 (국립환경과학원 교통환경연구소) ;
  • 정성운 (국립환경과학원 교통환경연구소) ;
  • 김대욱 (국립환경과학원 교통환경연구소)
  • Published : 2007.02.28
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Abstract

Nitrous oxide ($N_2O$) is an important trace gas in the atmosphere not only because of its large global warming potential (GWP) but also because of the role in the ozone depletion in the stratosphere. It has been known that soil is the largest natural source of $N_2O$ in global emission. However, anthropogenic sources contributing from industrial section is likely to increase with rising the energy consumption, and transportation as well. In this study, a total of 32 gasoline-powered passenger vehicles (ranging from small to large engine's displacement and also ranging from aged catalyst to new catalyst) were tested on the chassis dynamometer system in order to elucidate the characteristics of $N_2O$ emission from automobiles under different driving modes. Ten different driving modes developed by NIER were adapted for the test. The results show that the $N_2O$ emission decreases logarithmically with increase of vehicle speed over the all test vehicles ($N_2O$) emission = -0.062 Ln (vehicle speed) + $0.289,\;r^2=0.97$). It revealed that the larger engine's displacement, the more $N_2O$ emission were recorded. The correlation between $N_2O$ emission and catalyst aging was examined. It found that the vehicles with aged catalyst (odometer record more than 8,0000km) emit more $N_2O$ than those with new catalyst. Average $N_2O$ emission was $0.086{\pm}0.095\;N_2O-g/km$ (number of samples=210) for the all test vehicles over the test driving modes.

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References

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