The Emission of NO2 and NH3 in Selective Catalytic Reduction over Manganese Oxide with NH3 at Low Temperature

망간계 금속산화물을 이용한 저온 선택적 촉매 환원 반응에서 NO2와 NH3 배출

  • Kim, Sung Su (Department of Environmental Engineering, Kyonggi University) ;
  • Hong, Sung Chang (Department of Environmental Engineering, Kyonggi University)
  • 김성수 (경기대학교 공과대학 환경공학과) ;
  • 홍성창 (경기대학교 공과대학 환경공학과)
  • Received : 2007.03.09
  • Accepted : 2007.04.09
  • Published : 2007.06.10


The catalytic behavior of the manganese oxides was studied for the selective catalytic reduction with ammonia at a low temperature condition under $200^{\circ}C$. Outlet unreacted ammonia increases with decreasing temperature and increasing $NH_3/NOx$ mole ratio, however $NO_2$ shows an opposite result. $NO_2$ is generated by the adsorption of NO on the catalyst and the following oxidization to nitrates. Unreacted NH3 slip is not observed even at the $NH_3/NOx$ feed ratio above 1.0 due to the reaction between formed nitrates on the catalyst and adsorbed ammonia. The addition of Zr increases $NO_2$ generation, whereas the addition of CeO2 on the catalyst decreases $NO_2$ generation. Furthermore, the additon of the metal oxide induce DeNOx efficiency to reduce.


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