Abstract:nure biochar to study their SCR performance at low temperature. The effects of nitric acid treatment andMn loading on the performance of the catalysts were analyzed. The physicochemical properties of thecatalysts were studied by various characterization methods. The results showed that compared withSM700, the specific surface area and total pore volume of SM700A increased, while its average poresize and ash content decreased. When loaded with Mn, the specific surface area and total pore volumeof SM700A increased more obviously. Mn/SM700A had the highest activity for NH3-SCR with 63%NOXconversion, 97% N2selectivity and 77% NH3consumption at 150 ℃. Compared with SM700A,the adsorbed oxygen content on the surface of Mn/SM700A catalyst and Oα /Oβ increased significantly. SCRThe Mn ions on the surface of Mn/SM700A catalyst were extremely dispersed, and Mn4+/Mn3+hadstrong redox ability. Therefore, Mn/SM700A showed high catalytic activity for NH3-SCR. Close-