Removal of NO by simultaneous action of dielectric-barrier discharge and TiO₂photocatalyst

Abstract

Abstract\n NO oxidation by simultaneous action of a dielectric \nbarrier discharge and TiO photocatalyst was investigated as a function \nof the inlet gas composition (NO, O, N and the input energy. \nConcentrations of various NO species and ozone in the outlet were \ndetected by the optical absorption spectroscopy. Higher content of O \n(10% and higher) increased the removal of NO and resulted in a higher \noutput of NO. TiO coating on a reactor electrode resulted \nin the time-depending oxidation of NO. Initially the concentration of \nuntreated NO fell below the level achieved without TiO but after few \nminutes the positive effect of TiO diminished. The initial decrease in \nNO level due to the presence of TiO coating is explainable by surface \nreactions of NO species and absorbed oxygen. After few minutes, the surface \nstates responsible for the initial removal of NO saturated and the effect of \nTiO vanished.