The effect of transition metals (Me: Mn, Cu) on Pt/CeO2/Al2O3 catalysts for the catalytic reduction of NO by CO

Me/Pt/CeO2/Al2O3 (Me: Mn and Cu) catalysts and Pt/CeO2/Al2O3 catalyst were synthesized by a solution chemical reduction method to reveal the influence of a small amount of transition metals on the CO-SCR reaction. Various of analysis technologies were performed to study the structure and texture, physicochemical property, adsorption ability, redox property and surface state of the catalysts. The results revealed that the BET surface area, CO adsorption ability and redox property of Pt catalyst were enhanced after the addition of transition metals. Moreover, the addition of Cu generated the maximum reduced Pt species, Ce3+ and surface oxygen species. And the synergistic interactions among Cu2+/Cu+, Ce4+/Ce3+ and Pt4+/Pt2+ were conductive to form more oxygen vacancies, which played a key role to promote the CO-SCR performance and resulted in the best CO-SCR activity of Cu modified Pt/CeO2/Al2O3 catalyst at 80–240 °C.