Transactions of the Korean Society of Automotive Engineers (한국자동차공학회논문집)

The Korean Society of Automotive Engineers (한국자동차공학회)
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Experimental Investigation on the Reduction Characteristics of Nitric Dioxide(NO2) over Platinum-based Oxidation Catalyst

백금산화촉매를 통한 이산화질소(NO2)의 저감 특성에 관한 실험적 연구

  • Kim, Young-Deuk (Innovative Design Education Program for Mechanical Engineers, BK21 Project, Hanyang University) ;
  • Cho, Ja-Yun (Graduate School of Mechanical Engineering, Hanyang University) ;
  • Lee, Jung-Gil (Graduate School of Mechanical Engineering, Hanyang University) ;
  • Kim, Woo-Seung (Department of Mechanical Engineering, Hanyang University)
  • 김영득 (한양대학교 BK21 혁신설계기계인력양성사업단) ;
  • 조자윤 (한양대학교 대학원 기계공학과) ;
  • 이정길 (한양대학교 대학원 기계공학과) ;
  • 김우승 (한양대학교 기계공학과)
  • Received : 2011.11.24
  • Accepted : 2011.12.15
  • Published : 2012.07.01
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Abstract

The reduction characteristics of $NO_2$ to NO are experimentally studied over a platinum-based catalyst, especially at lower temperatures below about $200^{\circ}C$. In the present work, two types of steady-state experiments, engine bench and synthetic gas bench tests, are carried out in sequence. Steady-state engine bench tests with the DOC mounted on a light duty 4-cylinder 2.0 liter turbocharged diesel engine are performed and prove that CO plays a major role in $NO_2$ abatement at temperatures below the light-off temperature of CO oxidation, about $200^{\circ}C$. Synthetic gas bench tests are then performed using synthetic gas mixtures with CO, $C_3H_6$, NO, $NO_2$, $O_2$, $H_2O$ and $N_2$ in the $140{\sim}450^{\circ}C$ T-range and show that both CO and $C_3H_6$ are capable of reducing $NO_2$. It is noted that the reaction rate of $NO_2$ with $C_3H_6$ is much higher than that with CO. At temperatures below about $200^{\circ}C$, the reduction of $NO_2$ to NO is promoted with increasing CO concentration and $NO_2$/$NO_X$ ratio and with decreasing $O_2$ concentration, as well as with the presence of $H_2O$.

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References

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