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 room temperature to high temperature (500°C). The NO_x removal rate was significantly affected by the type of the catalyst or the gas temperature. When the conventional three-way catalyst for automobiles 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, The combination effect of nonthermal plasma and catalyst was confirmed below 200°C. More than 80% of NO_x was removed from synthetic flue gas by the combination of zeolite catalyst and hydrocarbons without nonthermal plasma discharge at 500 °C. Nonthermal plasma treatment could be useful even at high temperatures, where catalytic reactions were dominant