Abstract
Composite oxide catalysts have been widely studied in numerous fields. Species with different valences are responsible for different effect on activity. In this study, a battery of catalysts, of which support material are differently proportional phases of TiO2 by adjusting the amount of Sn and of which loading composition is MnCuOx, were synthesized. It is found that the doping of Sn could be in favor of the transformation from anatase TiO2 to rutile TiO2 at lower temperature, could enlarge the specific surface area and generate more oxygen vacancies, which could accelerate the oxidation of NO to NO2, beneficial for the “Fast-SCR” reaction at low temperature. In addition, Cu species prefer to exist in form of Cu0 on rutile TiO2., improving the reductive ability of catalysts and getting more monodentate nitrite species involved into the reaction. To recap, this study provides a theoretical guidance for preparation and exploration of Cu-based catalysts.
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