Research On The Removal Of NO By Dielectric Barrier Discharge Plasma Combined With Catalyst

Using non-thermal plasma technology combined with catalyst to remove nitrogen oxide in flue gas is a good effect flue gas comprehensive treatment techniques, and the dielectric barrier discharge is a common method of generating plasma, it has a good prospects in the flue gas treatment. In this paper, a coaxial cylindrical dielectric barrier reactor generate non-thermal plasma. Using bimetallic Ag and CuO supported catalysts and Ag alone supported catalysts were in research and using simulated flue gas under different catalytic conditions and different gas composition study effect of NO removal. The results showed that: a single load Ag catalyst for NO removal efficiency is better than the Ag/CuO catalyst, and the catalyst device combined with the non-thermal plasma is higher thana single catalyst device or separate plasma device for removing NO, the best of both temperature is150℃and200～300℃; For different gases, the two catalysts, increasing ethylene can facilitate the removal rate of NO, but not more ethylene, higher removal; When O2is increased, to the Ag/CuO/Al2O3catalyst, it will result to decrease removal of NO, but for Ag/Al2O3catalyst, the impact is not great; When adding SO2, to Ag/CuO/Al2O3catalyst, NO removal rate will be decreased, for Ag/Al2O3catalyst high concentration of SO2can lead to high rate of NO removal initially, but when the energy density reaches certain value, high concentration of SO2can decrease rate of NO removal. The reason is mainly due to form an intermediate on the catalyst surface, it is hardiy decomposition; Adding CO2will promote the removal of NO, but the effect is weak; For Ag/Al2O3catalyst, when adding H2O, NO removal rate was significantly reduced. By combining plasma device and catalyst device the NOx removal rate has been significantly improved, and there are some discussions for the removal of NO with different gases. The plasma combined with catalyst provide some experimental and theoretical basis for the industrial applications denitration.