Preparation and Characterization of MnO<sub>X</sub>-CeO<sub>2</sub>/TiO<sub>2</sub> Catalytic Material for SCR of NO<sub>X</sub> with NH<sub>3</sub> at Low Temperature

The MnO X -CeO 2 /TiO 2 catalytic material for low temperature SCR of NO X with NH 3 was prepared using aqueous solutions of three manganese salt as well as cerous nitrate and TiO 2 (anatase) powder by impregnation method. The properties of the catalytic materials were investigated by TG-DSC, XRF, XRD, XPS, BET and SEM. And the low temperature catalytic activity of the catalytic materials was measured. The results showed that, when manganese nitrate and manganese chloride and manganese acetate were used as precursors, respectively, the primary phases of catalytic materials were MnOx/MnO 2 , MnO 2 /Mn 8 O 10 Cl 3 and Mn 3 O 4 /MnO 2 , the surface Mn/Ti molar ratio were 0.68, 0.19 and 0.88, the surface area were 45.1m2/g, 25.1 m2/g and 48.6 m2/g ,respectively. The optimum NO X conversion rate of catalytic material from manganese nitrate precursor and manganese chloride precursor and manganese acetate precursor were 97.9% at 483K, 86.6% at 513K, 97.2% at 423K, respectively. Consequently, the higher low-temperature activity of MnO X -CeO 2 /TiO 2 from manganese acetate precursor may be attributed to higher surface and higher surface concentration of activity component.