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Received August 30, 2006
Accepted October 2, 2006
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Low-temperature catalytic reduction of nitrogen oxides with ammonia over supported manganese oxide catalysts
Department of Applied Chemistry, Division of Biotechnology and Nanotechnology, Ajou University, Suwon 443-749, Korea 1Department of Chemical Engineering, Division of Chemical Engineering and Materials Engineering,Division of Energy Systems Research, Ajou University, Suwon 443-749, Korea
Korean Journal of Chemical Engineering, January 2007, 24(1), 191-195(5), 10.1007/s11814-007-5031-2
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Abstract
MnOx supported on γ-Al2O3, TiO2, Y-ZrO2 and SiO2 was prepared by an impregnation and a depositionprecipitation method, and their catalytic activities for the low-temperature selective catalytic reduction (SCR) of NOx with NH3 in the presence of excess O2 were examined. The catalytic activity of the catalysts prepared by a depositionprecipitation method was higher than that of catalysts prepared by an impregnation method. The activity follows in the order: MnOx/TiO2.MnOx/γ-Al2O3>MnOx/SiO2>MnOx/Y-ZrO2. Supported MnOx catalysts prepared by a deposition-precipitation method appeared to have an amorphous manganese oxide phase and those prepared by an impregnation method exhibited a crystalline MnO2 phase, respectively. The addition of SO2 with H2O in the feeding gas slightly deactivates the SCR activity of MnOx/TiO2 catalysts.
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