NOx removal using nitrogen gas activated by dielectric barrier discharge at atmospheric pressure

Abstract The NO removal was carried out using injection of the nitrogen gas, which was activated by the dielectric barrier discharge with a one-cycle sinusoidal-wave power source. The discharge was intermittently formed between coaxial cylindrical electrodes with a space of 1.5 mm at an applied peak-to-peak voltage of 20–50 kV. The measured NO reduction was discussed on the basis of the electrical characteristics of the intermittent dielectric barrier discharge. Different from the NO reduction by ammonia radicals, NO was reduced at the measured lowest temperature, 200°C. NO reduction required high applied voltage and consequently large discharge time, which is close to the period of one cycle sinusoidal voltage. Thus, the total discharge time was not proportional to the applied voltage, and the NO reduction was not correlated solely with the discharge power.