Abstract: The adsorbents were prepared by uploading Mn/Cu on semi-coke using high-pressure impregnation under ultrasound-assistance, and the denitrification performance of adsorbents were tested.The effect on the denitrification activity of metal components and the molar ratio of Mn/Cu were mainly researched.Removing NO mechanism of Mn-Cu adsorbents was also explored by means of XRD, BET, XPS and AAS.The results show that the bimetallic Mn-Cu adsorbent has a much better ability to remove NO than the single metal adsorbent.The proper addition of copper can produce a synergistic effect between manganese and copper, thus significantly improving the denitrification activity of the adsorbent.The optimal impregnation molar ratio of Mn/Cu is 3 ∶ 1, and the best denitrification performance is obtained when the actual loading amount is 1 ∶ 1.The nitrate capacity and breakthrough time of M3C1 is 10.07 mg/g and 300 min above the removal efficiency of 80%, respectively.In the simulated flue gas with O₂, Mn³⁺ in the carbon skeleton is the main activate component removing NO, and the carbon skeleton provides a chemical adsorption reaction site, and the metal Cu plays a catalytic role.