Removal of NO by simultaneous action of dielectric-barrier discharge and TiO2 photocatalyst

I. Jõgi; V. Bichevin; M. Laan; A. Haljaste; H. Käämbre; V. Sabre

doi:10.1051/epjap/2009089

All issues

Volume 47 / No 2 (August 2009)

Eur. Phys. J. Appl. Phys., 47 2 (2009) 22817

Abstract

Issue		Eur. Phys. J. Appl. Phys. Volume 47, Number 2, August 2009 11th International Symposium on High Pressure, Low Temperature Plasma Chemistry (HAKONE XI)


Article Number		22817
Number of page(s)		5
Section		11th International Symposium on High Pressure, Low Temperature Plasma Chemistry (HAKONE XI)
DOI		https://doi.org/10.1051/epjap/2009089
Published online		05 June 2009

Eur. Phys. J. Appl. Phys. 47, 22817 (2009)
https://doi.org/10.1051/epjap/2009089

Removal of NO by simultaneous action of dielectric-barrier discharge and TiO₂ photocatalyst

I. Jõgi, V. Bichevin, M. Laan, A. Haljaste, H. Käämbre and V. Sabre

Institute of Physics, University of Tartu, Tähe 4, 51010 Tartu, Estonia

Corresponding author: indrek.jogi@ut.ee

Received: 3 January 2009
Accepted: 13 March 2009
Published online: 5 June 2009

Abstract

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 NO_x 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

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