The effect of moisture on SCR reaction of NMO (Natural Manganese Ore)

천연망간광석 SCR 반응에서 수분의 영향

  • Kim, Sungsu (Department of Environmental Engineering, Kyonggi University) ;
  • Hong, Sungchang (Department of Environmental Engineering, Kyonggi University)
  • 김성수 (경기대학교 환경공학과) ;
  • 홍성창 (경기대학교 환경공학과)
  • Received : 2007.05.09
  • Accepted : 2007.06.12
  • Published : 2007.08.10

Abstract

The effect of moisture in flue gas on SCR reaction of NMO (Natural Manganese Ore) was studied. The experiments were performed over NMO with NO, $NH_3$ at independent condition or simultaneous condition. $NH_3$ can be oxidized at low temperature by the lattice oxygen in NMO catalyst. The concentration of NO and $NO_2$ by $NH_3$ oxidation with moisture is higher above $300^{\circ}C$ than that without moisture. Moisture would competitively adsorb with NO and $NH_3$ on NMO catalyst. It caused poor NOx conversion to compete against $H_2O$. Besides the NOx conversion efficiency was reduced at below $250^{\circ}C$ because of the dipped $H_2O$ competitively adsorbed $NH_3$. The reactivity of NMO varied with the calcination temperature and the optimum calcination temperature was $400^{\circ}C$ regardless $H_2O$.

Keywords

NMO;SCR;moisture

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