Experimental Study Of Removal NO By Active Carbon Fibers Supported Copper Oxide And Zirconium Catalysis

Nitrogen oxide is one of the main atmospheric pollutants, and its emissions has been a serious threat to the environment the human beings rely on, and has been more and more attention. Selective Catalytic Reduction(SCR) is one of the most widely used and effective techniques for the removal of NOx from the flue gas of coal-fired power plant emissions. In recent years, due to the low temperature SCR technology with low running costs and reduce energy consumption characteristics of being more and more attention from researchers. From low temperature SCR technology research status of view, the main obstacle of technology industrialization is the activity in the low temperature range is lower, catalyst poisoning resistance performance is poor, the reaction mechanism is not clear and so on. To solve these problems, This paper select activated carbon fiber as a carrier, Cu O and ZrO2 as the main active ingredient of the catalyst, the low temperature SCR denitration performance for a more detailed study.The effects of concentrated nitric acid treated activated carbon fiber, CuO and Zr O2 alone and together as the active ingredient and and the concentration of oxygen NH3/NO denitration reaction conditions, and by the specific surface area(BET) and pore size analysis, X-ray diffraction(XRD), scanning electron microscopy(SEM), thermogravimetric and differential thermal analysis(TG-DTA) of catalyst characterization and structural analysis, and discusses the influence of oxygen content, NH3/NO on the series catalyst. The results show that activated carbon fibers after nitric acid treatment, the specific surface area increases 24.338m2/g, adsorption capacity increases; loaded CuO and ZrO2, the specific surface area of the catalyst decreases with the increase of load, pore size analysis shows that Cu O and ZrO2 load has not obvious effects on the pore structure of activated carbon, consistent with XRD, SEM analysis results. Cu O, ZrO2 loading below 0.033CuO/ACFN, 0.025ZrO2/time ACFN catalyst, are no obvious CuO, Zr O2 characteristic peak appears, the active components are uniformly distributed in the activated carbon fiber surface.Combined with the denitration activity experiments, the series CuO-ZrO2/ACFN catalyst has higher activity of denitration than the series CuO/ACFN and series ZrO2/ACFN, 3:1CuO-Zr O2/ACFN catalyst reaches the maximum DeNOx efficiency of 92% in 260℃. Oxygen can promote denitration reaction through oxidation of NO to NO2, but the oxygen concentration is too small or too large is not conducive to denitration reaction, tested the oxygen concentration of 3% was best; the denitration reaction mechanism shows that NH3/NO = 1:1, NH3/NO too large will lead to direct oxidation of NH3, thereby reducing the denitration efficiency the experimental results show that the reasonable NH3/NO = 1.Through systematic study of this paper, the development of a new type of Cu OZr O2/ACFN low temperature SCR catalyst composite oxide, compared with the prior reported SCR catalyst, the catalytic activity is higher at low temperatures and low cost, laid the foundation for low-temperature SCR process to achieve industrial application, further improve the low temperature SCR catalysts in the future.