A Study on Coaxial Type DBD Decomposing NO/N2 Mixture Gas by Optical Emission Spectrum

Through establishing a test system of coaxial dielectric barrier discharge type non-thermal plasma reactor, using Q-V Lissajous figure method to measure its electrical parameters, optical emission spectrum of NO/N₂ mixed gas system was analyzed, and the effects of the applied voltage peak-peak value(V_P-P) on the optical emission spectrum intensity of NO, N₂ excited state species were studied when NO/N₂ mixture gas passed the reactor´s discharge area. The results showed that high-energy electrons produced by non-thermal plasma played an effective role on the NO, N₂ molecules and produced a variety of excited states matters, such as NO(A²Σ⁺-X²Π), N₂(C³Π _u→B³Π _g); NO(A²Σ⁺-X²Π) optical emission spectrum strength firstly increased then decreased with the increase of V_P-P, N₂(C₃Π_u→B₃Π_g) optical emission spectrum strength increased with the increase of V_P-P; in NO/N₂ mixture gas system, NO was removed mainly through the reduction reaction, its removal rate could reach 98%.