화학공학소재연구정보센터
홈 로그인 로그아웃 연락처 사이트맵
Applied Chemistry for Engineering, Vol.28, No.1, 64-72, February, 2017
DOI10.14478/ace.2016.1103  Export Citation
증진제 첨가에 따른 Pt/Al2O3 촉매의 CH4-SCR 반응특성 연구
Effect of Promoting Metal in Pt/Al2O3 Catalyst on Selective Catalytic Reduction of NO Using CH4
원종민, 홍성창1, †
  • 경기대학교 환경에너지공학과 일반대학원
  • 1환경에너지공학과
Jong Min Won, and Sung Chang Hong1, †
  • Department of Environmental Energy Engineering, general graduate school, Kyonggi University, 94 San, Iui-dong, Youngtong-ku, Suwon-si, Gyeonggi-do 16227, Korea
  • 1Department of Environmental Energy Engineering, Kyonggi University, 94 San, Iui-dong, Youngtong-ku, Suwon-si, Gyeonggi-do 16227, Korea
E-mail:
초록
본 연구에서는 다양한 증진제에 따른 CH4-SCR 반응특성을 확인하기 위하여 Pt/Al2O3를 기본으로 한 촉매에 알칼리, 알칼리 토류 금속을 담지하여 습식함침법으로 제조한다. 본 연구를 통해 Pt/Al2O3 촉매에 Na를 담지시킬 경우 Pt와 Na 원자간 electronegative gap의 발생으로 Pt의 valence state 변화를 일으키며, 금속상 Pt의 비율이 증가됨을 확인할 수 있다. 또한 Na 첨가를 최적화시켜 제조한 촉매의 금속상 Pt종은 촉매표면에서 NO species 흡착 증진과 환원제로 사용되는 CH4의 CO2로의 산화를 억제시킨다. 이때, Na/Pt의 mole ratio는 4.0이 최적화이며, CH4-SCR 효율이 가장 우수하다.
A series of Pt-based γ-Al2O3 catalysts promoted with several alkali and alkaline earth metals were prepared by a wet impregnation method. We confirmed that the addition of Na to Pt/γ-Al2O3 could cause a change in the oxidation state of Pt through an electronegative gap between Pt and Na atom, and increase the ratio of the metallic Pt. The metallic Pt species made by adding an optimum Na content improved the adsorption of NO species on the catalyst surface and restrained the oxidation of CH4 to CO2. When molar ratio of Na/Pt was 4.0, the highest catalytic activity could be obtained.
Keywords:SCR;NOx;CH4;valence state;electro-negative
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