Effects of coexisting gases on NO removal using corona discharge
Details
Effects of H_2O, CO_2, CH_4 and C_2H_4 existing in automotive exhaust gas on NO_x removal using a DC corona discharge were investigated experimentally. A simulated gas was used in this experiment. N_2/O_2/NO system was basis of the simulated gas. The effect of coexisting gas on NO_x removal was investigated by adding each coexisting gases to the N_2/O_2/NO mixture. In case of H_2O or C_2H_4 addition, 90% NO_x reduction was achieved in negative corona discharge with low energy density. When negative corona discharge applied to the simulated exhaust gas (N2/O2/NO/H_2O/CO_2/C_2H_4), more than 90% DeNO_x was achieved. However, more CO, HNO_3, O_3 and N_2O was formed with increasing the energy density. It was found that the optimum energy density of DeNO_x using corona discharge for simulated gas was about 250 J/L in this experiment.
