Abstract: Active coke is a kind of carbon based catalytic denitrification material with high cost performance.In order to study its denitrification performance and thermal regeneration under the condition of low temperature and no NH3,the fixed bed experimental device was used to evaluate the performance of NO removal at low temperature and in-situ thermal regeneration experiment.The specific surface area,pore size distribution and surface functional groups of the two experimental active coke were characterized and analyzed to study the influence of surface characteristics on the NO removal performance.The effect of active coke on NO removal at low temperature and the mechanism of thermal regeneration were preliminarily discussed.The results show that under the experimental conditions of NO removal with the inlet volume concentration of NO 100 × 10-6,the volume concentration of O_26%,the reaction temperature 70 ℃ and the space velocity1 000 h-1,the outlet NO concentration increases gradually with time,and the denitrification rate decreases linearly.Combined with the infrared characterization,it is qualitatively indicated that there is catalytic oxidation and adsorption in the process of NO removal from the active coke.The possible mechanism is that the active functional group in the active coke oxidizes NO to NO_2,which occurs on the pore surface of the active coke in the form of adsorbed NO_2,and some of the chemically adsorbed NO_2 reacts with disproportionation on the surface of the active coke,forming adsorbed NO_3.Under the thermal regeneration test conditions of 6% O_2,70-400 ℃ regeneration temperature and 2 ℃/min heating rate,the NO concentration first increases rapidly,reaches the platform at 100-150 ℃,and reaches the peak value of desorption capacity at 210 ℃ .At this time,the conversion concentration of NO desorption is about 85 mg/m3,and then the NO concentration gradually decreases to zero.When the simulated flue gas is above 250 ℃,CO begins to separate out,and the amount of CO generated is directly proportional to the regeneration temperature.In the process of in-situ thermal regeneration of the activated coke after denitration,the adsorbed NO_2 is decomposed into NO and released.The microstructure of the two kinds of activated coke samples is similar.The isothermal curves of AC1 and AC2 belong to IV type isothermal curves,and the hysteresis loop belongs to H4 type,which shows that the microstructure of the two kinds of samples is mostly slit like pores.The adsorption capacity at the inflection point of the low P/P0 area of the adsorption desorption curve,pore volume and BET specific surface area of AC2 are slightly larger than those of AC1,indicating that there are more micropores in the former sample.The pore size of AC1 and AC2 are 1.76 and 1.57 nm,respectively.The results of XPS and denitrification performance evaluation of the two samples show that the denitrification activity of the active coke samples containing more oxygen/nitrogen functional groups is stronger.