Role of Mn: Promotion of Fast-SCR for Cu-SAPO-34 in Low-Temperature Selective Catalytic Reduction with Ammonia

There is a required need for improving low-temperature selective catalytic reduction with ammonia (NH3-SCR) activities of catalysts. In this paper, Cu-SAPO-34 and Mn/Cu-SAPO-34 catalysts were prepared by a one-pot hydrothermal synthesis method. ICP-OES, N2 adsorption/desorption, XRD, FT-IR, SEM, H2-TPR, XPS, NH3/NO-TPD were performed to study the properties of the catalysts. Mn promoted Cu-SAPO-34 shows considerably improvement in low-temperature NH3-SCR activity with almost 100% NOx conversion between 220–300 °C. It is suggested that the excellent catalytic activity of Mn/Cu-SAPO-34 is ascribed to MnO2 which can promote “fast-SCR”. H2O/SO2 resistance tests were also investigated and the results show that the catalysts both exhibit strong resistance to H2O but the introduction of Mn doesn’t improve the SO2 resistance of Cu-SAPO-34.