Removal of NO by simultaneous action of dielectric-barrier discharge and TiO2 photocatalyst
Institute of Physics, University of Tartu, Tähe 4, 51010 Tartu, Estonia
Corresponding author: email@example.com
Accepted: 13 March 2009
Published online: 5 June 2009
NO oxidation by simultaneous action of a dielectric barrier discharge and TiO2 photocatalyst was investigated as a function of the inlet gas composition (NO, O2, N2) and the input energy. Concentrations of various NOx species and ozone in the outlet were detected by the optical absorption spectroscopy. Higher content of O2 (10% and higher) increased the removal of NO and resulted in a higher output of N2O5. TiO2 coating on a reactor electrode resulted in the time-depending oxidation of NO. Initially the concentration of untreated NO fell below the level achieved without TiO2 but after few minutes the positive effect of TiO2 diminished. The initial decrease in NO level due to the presence of TiO2 coating is explainable by surface reactions of NO species and absorbed oxygen. After few minutes, the surface states responsible for the initial removal of NO saturated and the effect of TiO2 vanished.
PACS: 52.80.Tn – Other gas discharges / 82.33.Xj – Plasma reactions (including flowing afterglow and electric discharges) / 82.65.+r – Surface and interface chemistry; heterogeneous catalysis at surfaces
© EDP Sciences, 2009