A Study on Direct Decomposition and Selective Catalytic Reduction of NO over Ru-HZSM-5 Catalyst in the Presence of Excess Oxygen

과잉 산소 존재 하에서 Ru-HZSM-5촉매를 사용한 NO 분해 반응 및 선택적 촉매 환원 반응에 관한 연구

  • Bae, Jae Yong (Department of Chemical Technology, DongYang Technical College) ;
  • Chung, Sang Chul (Department of Chemical Engineering, Seoul National University) ;
  • Lee, Wha Young (Department of Chemical Engineering, Seoul National University)
  • 배재용 (동양공업전문대학 공업화학과) ;
  • 정상철 (서울대학교 화학공학과) ;
  • 이화영 (서울대학교 화학공학과)
  • Received : 1997.12.08
  • Accepted : 1998.03.16
  • Published : 1998.06.10

Abstract

Reduction activity of precious metal-loaded HZSM-5 for NO has been studied and was compared to that of Cu-HZSM-5 in the presence of excess oxygen. It was found that among the catalysts used in this study, Ru-HZSM-5 was the most active catalyst for the reduction of NO to $N_2$ in the absence of hydrocarbon reductant. The highest conversion obtained was 45%. No severe inhibition of water vapor to the reduction was observed. It is suggested that the higher catalytic activity of Ru-HZSM-5 may result from the better ability to oxidize NO to $NO_2$ in the presence of excess oxygen. A proposed reaction mechanism for the reduction of NO to $N_2$ in the presence of excess oxygen is that NO is oxidized to $NO_2$ on the surface of Ru-HZSM-5 catalyst and the adsorbed $NO_2$ on the surface is then decomposed to $N_2$. $NO_2$ is supposed to the reaction.

Keywords

Acknowledgement

Supported by : 한국학술진흥재단

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