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

Kim, Sungsu (Department of Environmental Engineering, Kyonggi University)
Hong, Sungchang (Department of Environmental Engineering, Kyonggi University)
Publication Information
Applied Chemistry for Engineering / v.18, no.4, 2007 , pp. 350-355 More about this Journal
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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