村還 Abstract: A series of東用 MnOx–CeO2 and MnOx–TiO2 catalysts were prepared船理 by a homogeneous pre國秒cipitation method and their catalytic近校 activities for the NO oxidation i爸現n the absence or presence of SO2 were evaluated. Results show that 議睡the optimal molar ratio of Mn/Ce話從 and Mn/Ti are 0.7 and 0.5, respe家鐘ctively. The MnOx–CeO2 catalyst exhibits higher ca學關talytic activity and better resista路是nce to SO2 poisoning than the MnOx–TiO2 catalyst. On the bas家少is of Brunauer–Emmett–Teller (BET)子在, X-ray diffraction (XRD), and s農日canning transmission electron microsc到學ope with mapping (STE藍業M-mapping) analyses, it is們刀 seen that the MnOx–CeO2 catalyst possesses higher BET 內請surface area and better dispersion of M頻弟nOx over the catalyst th黃大an MnOx–TiO2 catalyst. X-ray photoelectron spectrosc坐兵opy (XPS) measurements reveal th我來at MnOx–CeO2 catalyst provides the abundance of Mn3+ and more surface adsorbed oxygen, 區高and SO2 might be preferentially adsorbed to th嗎行e surface of CeO2 to form sulfate speci舊購es, which provides a protection of M很兒nOx active sites from being poi船到soned. In contrast, 麗道MnOx active sites over the MnOx–TiO2 catalyst are easily and quickly sulf西南ated, leading to rapid deactivati從文on of the catalyst for N風體O oxidation. Furthermore, temperatu議站re programmed desorption wi姐城th NO and O2 (NO + O2-TPD) and in situ diffuse reflect雜樹ance infrared transform sp子算ectroscopy (in situ DRIFTS) charac東大terizations results show t票雨hat the MnOx–CeO2 catalyst displays much stronger abil厭友ity to adsorb NOx than the MnOx–TiO2 catalyst, especially after SO2 poisoning.
