Study on the relationship between physicochemical properties and catalytic activity of Mn₂O₃ nanorods

Selective catalytic reduction technology was considered to be the most effective technology for NO_x treatment, and Mn₂O₃ had good catalytic activity. In this paper, we successfully synthesized α-Mn₂O₃ and γ-Mn₂O₃ nanorods by hydrothermal method. Moreover, in order to study the effects of surface physicochemical properties on the activities of Mn₂O₃ nanorods, XRD, Raman, FESEM, BET, H₂-TPR, NH₃-TPD, DRIFT and XPS were performed in detail. The results showed that the NH₃-SCR performances of γ-Mn₂O₃ were better than that of α-Mn₂O₃. The H₂-TPR, DRIFT and NH₃-TPD results demonstrated that γ-Mn₂O₃ possessed stronger reducing ability, more acid sites and stronger acid strength than α-Mn₂O₃. In addition, the XPS results displayed that more chemisorbed oxygen existed on the surface of γ-Mn₂O₃ nanorods. Based on the above mentioned favourable properties, γ-Mn₂O₃ nanorods had an excellent performance than α-Mn₂O₃. (paper)