58.
This paper concerns the influence of a direct current (dc) corona discharge on production and reduction of NO, NO
2 and N
2O in N
2:O
2:CO
2 and N
2:O
2:CO
2:NO
2 mixtures. The corona discharge was generated in a needle-to-plate reactor. The positively polarized electrode consisted of 7 needles. The grounded electrode was a stainless steel plate. The gas flow rate through the reactor was varied from 28 to 110 cm
3/s. The time-averaged discharge current ranged from 0 to 6 mA. It was found that in the N
2:O
2:CO
2 mixture the corona discharge produced NO, NO
2 and N
2O. In the N
2:O
2:CO
2:NO
2 mixture the reduction of NO
2 was between 6–56%, depending on the concentration of O
2, gas flow rate and corona discharge current. The NO
2 reduction was accompanied by production of NO and N
2O. The results show that efficient reduction of nitrogen oxides by a corona discharge cannot be expected in the mixtures containing N
2 and O
2 if reducing additives are not employed.
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