Effect of Coexisting Gases on NO Removal Using Corona Discharge

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Effects of H₂O, CO₂, CH₄ and C₂H₄ contained in automotive exhaust gas on NO removal by using a DC corona discharge were investigated experimentally. In this experiment, N₂/O₂/NO mixture was used as a base gas of the simulated exhaust gas. To clarify the effect of the individual coexisting gas on NO removal, each coexisting gas was added to the base gas. The results showed that the existence of H₂O or C₂H₄ was effective for NO removal with low energy density. Also, when negative corona discharge was applied to the simulated exhaust gas (N₂/O₂/NO/H₂O/CO₂/C₂H₄ mixture), the efficiency of DeNOx was more than 90%. However, the by-products such as CO, O₃, HNO₃ and N₂O increased with increasing the energy density. It was found that the optimum energy density of corona discharge was about 250J/L for DeNO_x of simulated exhaust gas.