THE INFLUENCE OF NH3 ON NO2 CONVERSION IN A DC CORONA DISCHARGE IN N-2-O-2-CO2-NO2-NH3 MIXTURES

The aim of this paper is to investigate the influence of NH3 additive (540-1470 ppm) on the conversion of NO2 and the creation of NO and N2O in a mixture of N-2:O-2:CO2:NO2:NH3 subjected to the so-called direct current (de) corona discharge. The de corona discharge was generated in a needle-to-plate reactor. Seven positively polarized needles were used as one electrode and a stainless steel plate as the other. The ti me-averaged discharge current was varied from 0 to 7 mA. It was found that the de corona discharge decomposed NO2 and produced NO and N2O. T he reduction of NO2 was higher without NH3 additive if the residence t ime of the operating gas was relatively short. However, in a longer co rona discharge processing the NH3 additive may be useful for reduction of NO2.