DEVICE FOR REMOVING HARMFUL GAS

摘要

PURPOSE:To improve a NOX removing rate in a device for removing harmful gas of low concentration in contaminated air. CONSTITUTION:A harmful gas removing device 4 is constituted by dividing it into a pre-stage part 4a for removing NO2 and a poststage part 4b for removing the other gases. In the pre-stage part 4a, NO2 is removed by a carbon filter 13 and next a powder mixture of TiO2 powder and Fe2O3 powder is made to stick on a carbon filter 15 and the filter 15 is irradiated with light of >=400nm wavelength from a light source 16 to remove NO and SO2 in the poststage part 4b. Thereby the removal of NO based on an oxidizing active seed of TiO2 is made better than made when NO2 coexists to improve a NOX removing rate.