DeNOx process in flue gas combined with nonthermal plasma and catalyst

Catalysts were used to enhance NO_x removal reactions by the nonthermal plasma from the room temperature to high temperature, 500°C. NO_x removal rate was significantly affected by the type of the catalyst or the gas temperature. When the conventional 3 way catalyst for an automobile was activated at 500°C, nonthermal plasma was not effective in removing NO_x. When hydrocarbons (ethylene) were added to the synthetic flue gas, zeolite catalyst became very active at high temperature. Combination effect of nonthermal plasma and catalyst was confirmed below 200°C. More than 80% NO_x was removed from synthetic flue gas by combination of zeolite catalyst and hydrocarbons without nonthermal plasma discharge at 500°C. Nonthermal plasma treatment could be useful even at high temperature where catalytic reaction were dominant