Enhanced SO2 and H2O resistance of MnTiSnOy composite oxide for NH3-SCR through Sm modification

NOx is one of the main sources air pollution, and abatement emission has aroused increasing attention. The NH3-SCR technology mature widely used for controlling emissions from fixed sources. In this work, SmxMnTiSnOy was synthesized by a mixed solvothermal synthesis. performance tested H2O SO2 resistance Sm0MnTiSnOy, Sm0.1MnTiSnOy, Sm0.2MnTiSnOy catalysts (5 %H2O, 25 ppm SO2) were at 250 °C. physicochemical properties studied XRD, FESEM, TEM, BET, XPS, H2-TPR, NH3-TPD In-situ DRIFTS. experimental results reveal that better low-temperature splendid durability. Moreover, appropriate Sm doping increases specific area enhances acidity catalyst’s surface. DRIFTS suggest adsorption activation NH3 are primary importance in reaction. Besides, large number weak acid sites on conducive to adsorb activate good redox ability facilitates bidentate nitrate, respectively. Meanwhile, could transfer electrons species Mn species, which inhibits formation sulfate.