Plasma-Assisted Catalytic Oxidation for Nitrogen Oxides Abatement

A detailed study on the removal of oxides of nitrogen (NOx) was carried out using non-thermal plasma (dielectric barrier discharge plasma) promoted catalytic process. NO could be oxidized into NO₂, N₂O₃, etc. by the plasma-assisted catalytic oxidation process, and which can be absorbed easily by water to recycle. The results showed a remarkable synergetic effect, 94% NO removal efficiency was obtained at 14W, 150°C under the condition of 500ppm NO, 3% O₂. It was found that NO removal efficiency increased with the applied power rising. However, when applied power was above 14w the NO was mostly decomposed into N₂. The GHSV and the inlet concentration of NO had little effect on NO oxidation. The removal efficiency of NO decreases with increased in O₂ concentration. However, more than 80% NO removal efficiency was obtained when the O₂ concentration was between 1%~5%.