NOx REMOVAL USING DBD WITH UREA SOLUTION AND PLASMA TREATED TiO2 PHOTO CATALYST

Two kinds of experiments for NOx removal have been carried out. One is the experiment using dielectric barrier discharge (DBD) with the aid of adding urea solution. The other is the experiment with plasma treated TiO 2 photo catalyst. For adding urea solution the energy efficiency of NOx removal by DBD is better than without the adding by more than 10 times at Vac ~7.2kV. The adding water only also shows good result. So the improvement in NOx removal by DBD with urea solution is not only due to urea but also water. TiO 2 films are developed on the one side of a quartz tube at 500 o C by use of the sol-gel method. Then the TiO 2 films have been processed in hydrogen or nitrogen plasma. The difference of NOx removal rate between the plasma treated films and no treated films has been measured, in which measurements a chemical lamp, black light and fluorescent lamp were used. The results show that the hydrogen plasma treated film is the most efficient as photo catalyst for NOx removal.