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

  • 제18권1호
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  • Pages.32-39
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  • 2007
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  • 1738-7264(pISSN)
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  • 2288-7407(eISSN)
한국수소및신에너지학회 (The Korean Hydrogen and New Energy Society)
권호 표지

$La_xCe_{1-x}Co_yCu_{1-y}O_{3-{\alpha}}$ Perovskite촉매의 선택적 CO 산화반응에 관한 연구

Study on the Selective CO Oxidation Using $La_xCe_{1-x}Co_yCu_{1-y}O_{3-{\alpha}}$ Perovskite Catalysts

  • 강대규 (전북대학교 수소.연료전지공학과) ;
  • 이영일 (전북대학교 수소.연료전지공학과) ;
  • 손정민 (전북대학교 수소.연료전지공학과)
  • Kang, Dae-Kyu (Graduate School of Hydrogen Fuel Cells Engineering, Chonbuk National Univ.) ;
  • Lee, Young-Il (Graduate School of Hydrogen Fuel Cells Engineering, Chonbuk National Univ.) ;
  • Sohn, Jung-Min (Graduate School of Hydrogen Fuel Cells Engineering, Chonbuk National Univ.)
  • 발행 : 2007.03.15
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초록

CO oxidation and selective CO oxidation of $La_xCe_{1-x}Co_yCu_{1-y}O_{3-{\alpha}}$ perovskite(x=1, 0.9, 0.7. 0.5; y=1, 0.9, 0.7, 0.5) were investigated. For CO oxidation, catalytic activities were studied according to different preparation conditions such as pH and calcination temperature. The influence of the change of the $O_2$ concentration for selective CO oxidation was studied, too. The substitution of Ce for La improved the catalytic activity for CO oxidation and selective CO oxidation and best activity was observed for $La_{0.7}Ce_{0.3}CoO_3$ prepared at pH 11 and calcined at $600^{\circ}C$. The temperature of 90% CO conversion for CO oxidation using $La_{0.7}Ce_{0.3}CoO_3$ was $230^{\circ}C$. In contrast to the enhancement effect by Ce substitution, the partial substitution of Cu for Co in $LaCo_yCu_{1-y}O_{3-{\alpha}}$ decreased catalytic activities for CO oxidation reaction compared to that using $LaCoO_3$. For selective CO oxidation, the best CO conversion was 66% at $230^{\circ}C$ for $La_{0.7}Ce_{0.3}CoO_3$. The CO conversion of $La_{0.7}Ce_{0.3}CoO_3$ was greatly increased from 66% to 91% as increasing $O_2$ concentration from 1% to 2%.

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