Transactions of the Korean hydrogen and new energy society (한국수소및신에너지학회논문집)

The Korean Hydrogen and New Energy Society (한국수소및신에너지학회)
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The Selective Oxidation of CO in Hydrogen Rich Stream over Alumina Supported Cu-Ce Catalyst

알루미나에 담지된 Cu-Ce 촉매상에서의 개질수소가스에 포함된 CO의 선택적 산화 반응에 관한 연구

  • Park, J.W. (Department of Chemical Engineering, Chungnam Nationnl University) ;
  • Jeong, J.H. (Department of Chemical Engineering, Kyungpook National University) ;
  • Yoon, W.R. (Hydrogen/Fuel Cell Research Department, KIER) ;
  • Lee, Y.W. (Department of Chemical Engineering, Chungnam Nationnl University)
  • 박종원 (충남대학교 화학공학과) ;
  • 정진혁 (경북대학교 화학공학과) ;
  • 윤왕래 (한국에너지기술연구원 수소 연료전지 연구부) ;
  • 이영우 (충남대학교 화학공학과)
  • Published : 2003.06.15
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Abstract

$Cu-Ce/{\gamma}-Al_2O_3$ based catalysts were prepared and tested for selective oxidation of CO in a $H_2$-rich stream(1% CO, 1% $O_2$, 60% $H_2$, $N_2$ as balance). The effects of Cu loading and weight ratio(=Cu/(Cu+Ce)) upon both activity and selectivity were investigated upon the change in temperatures, It was also examined how the activity and selectivity of catalysts were varied with the presence of $CO_2$ and $H_2O$ in the reactant feed. Among the various Cu-Ce catalysts with different catalytic metal composition, Cu-Ce(4 : 16 wf%) /${\gamma}-Al_2O_3$ catalyst showed the highest activity(>$T_{99}$) and selectivities(50-80%) under wide range of temperatures($175-220^{\circ}C$). However, in the Cu-Ce(4 : 16 wt%)/ ${\gamma}-Al_2O_3$, the presence of $CO_2$ and $H_2O$ in the reactant feed decreased the activity and the maximum activity(>$T_{99}$) in terms of reaction temperature moved by about $25^{\circ}C$ toward higher temperature, the $T_{>99}$ window was seen between $210-230^{\circ}C$ (selectivity 50-75%). From $CO_2-/H_2O-TPD$, it can be concluded that the main cause for the decrease in catalytic activity may be attributed to the blockage of the active sites by competitive adsorption of water vapor and $CO_2$ with the reactant at low temperatures.

Keywords

Acknowledgement

Supported by : 과학기술부

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