Korean Chemical Engineering Research

  • 제48권6호
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  • Pages.776-783
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  • 2010
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  • 0304-128X(pISSN)
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  • 2233-9558(eISSN)
한국화학공학회 (The Korean Institute of Chemical Engineers)
권호 표지

수소생산을 위한 메탄 부분산화용 코발트와 니켈촉매의 반응특성 연구

Partial Oxidation of Methane for Hydrogen Production over Co and Ni Catalysts

  • 이상식 (창원대학교 화공시스템공학과) ;
  • 홍주환 (창원대학교 화공시스템공학과) ;
  • 하호정 (창원대학교 화공시스템공학과) ;
  • 김병관 (창원대학교 화공시스템공학과) ;
  • 한종대 (창원대학교 화공시스템공학과)
  • Lee, Sang-Sik (Department of Chemical Engineering, Changwon National University) ;
  • Hong, Ju-Hwan (Department of Chemical Engineering, Changwon National University) ;
  • Ha, Ho-Jung (Department of Chemical Engineering, Changwon National University) ;
  • Kim, Byung-Kwan (Department of Chemical Engineering, Changwon National University) ;
  • Han, Jong-Dae (Department of Chemical Engineering, Changwon National University)
  • 투고 : 2010.04.23
  • 심사 : 2010.05.12
  • 발행 : 2010.12.31
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초록

수소생산을 위한 메탄의 부분산화용 촉매로 알루미나에 담지된 코발트와 니켈 촉매를 함침법으로 제조하였다. 메탄의 부분산화반응을 위한 이들 촉매의 반응활성은1기압, $CH_4/O_2=2.0$과 $450{\sim}650^{\circ}C$의 온도영역에서 조사하였다. 담지량이 다른 코발트촉매와 니켈촉매의 반응활성을 비교하고 코발트촉매에 니켈을 첨가한 이성분금속 촉매의 반응활성을 조사하였다. 그리고 코발트촉매와 니켈촉매에 첨가된 Ce와 La의 첨가효과를 조사하였다. 이들 촉매의 특성은 XRD와 SEM/EDX로 분석하였다. 코발트와 니켈은 10 wt%의 담지량이 적절한 것으로 나타났다. 이들 10 wt% 담지 코발트와 니켈촉매는 열역학적 평형값에 가까운 메탄의 전환율과 CO의 선택성을 나타내었으나 $H_2$의 선택성은 평형값보다 다소 낮게 나타났다. 코발트촉매에 니켈을 첨가한 이성분금속 촉매에서 $H_2$의 선택성은 증가하였으나 전환율을 고려하면 니켈을 첨가한 이점은 나타나지 않았다. 코발트촉매에서는 Ce의 첨가와 니켈촉매에서는La의 첨가로 메탄의 전환율과 수소의 선택성을 높일 수 있었다.

Co and Ni catalysts supported on $Al_2O_3$ for partial oxidation of methane producing hydrogen were synthesized using impregnation to incipient wetness. The activities of these catalysts for the partial oxidation of methane was investigated at 1 atm and $CH_4/O_2=2.0$ in the temperature range of $450{\sim}650^{\circ}C$. The reaction activity of $Ni/Al_2O_3$ and $Co/Al_2O_3$ catalysts with different loading was investigated. And the beneficial effects of Ni addition to $Co/Al_2O_3$ and the promotional effects of Ce and La addition to $Ni/Al_2O_3$ and $Co/Al_2O_3$ were investigated. These catalysts were characterized by XRD and SEM/EDX. Comparing catalyst loadings, 10 wt% Co and 10 wt% Ni were found to be optimal at the experimental conditions. The 10 wt% $Ni/Al_2O_3$ and 10 wt% $Co/Al_2O_3$ catalysts in partial oxidation of methane showed $CH_4$ conversions and CO selectivity close to the thermodynamic equilibrium levels, but showed lower $H_2$ selectivity than equilibrium level. The addition of Ni to $Co/Al_2O_3$ exhibited higher $H_2$ selectivity but beneficial effect was not observed in the $CH_4$ conversion. Addition of Ce to $Co/Al_2O_3$ and addition of La to $Ni/Al_2O_3$ a improved the $CH_4$ conversion level and $H_2$ selectivity.

키워드

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