Abstract: A series of Mn的樂Ox–CeO2 and MnOx–TiO2 catalysts were prepared火土 by a homogeneous precip這月itation method and their catalyt習術ic activities for the NO oxidat兒慢ion in the absence or p風遠resence of SO2 were evaluated. Results sho線日w that the optimal molar ratio o間能f Mn/Ce and Mn/Ti are 0.7 and 0.5,唱秒 respectively. The MnOx–CeO2 catalyst exhibits hig友水her catalytic activity and bette物這r resistance to SO2 poisoning than the MnOx–TiO2 catalyst. On the bas音少is of Brunauer–Emmett–Tell商美er (BET), X-ray diffract遠員ion (XRD), and scanning 亮黑transmission electron microscope with腦習 mapping (STEM-mapping) analys討媽es, it is seen that the M北雜nOx–CeO2 catalyst possesses higher BET 理中surface area and better dispersion of M都海nOx over the catalyst than MnOx–TiO2 catalyst. X-ray photoelectron sp音體ectroscopy (XPS) measurement著要s reveal that MnOx–CeO2 catalyst provides the abundance of 多能Mn3+ and more surface adsorbe黃站d oxygen, and SO2 might be preferentially adsorbed 一短to the surface of CeO2 to form sulfate specie我拍s, which provides a protection of Mn做區Ox active sites from being黃去 poisoned. In contrast, MnOx active sites over th場看e MnOx–TiO2 catalyst are easily and 秒愛quickly sulfated, leading to rapi男鐘d deactivation of the catal話畫yst for NO oxidation. Furthermore年聽, temperature programmed d我場esorption with NO and O2 (NO + O2-TPD) and in situ diffuse 大場reflectance infrared tran要見sform spectroscopy (in si雪紙tu DRIFTS) characterizations results sh子男ow that the MnOx–CeO2 catalyst displays much stronger我工 ability to adsorb NOx than the MnOx–TiO2 catalyst, especially aft醫就er SO2 poisoning.
