Application of a non-thermal surface plasma discharge in wet condition for gas exhaust treatment: NOx removal

This paper deals with the NOx removal with the help of a non-thermal surface plasma discharge in wet conditions. The gas treatment device consisting of a surface discharge and a wet-type reactor, was characterized through FTIR and electrical measurements. The ability of the proposed system for the cleaning of gas exhaust was studied. NOx as gaseous pollutant was decomposed effectively. To improve the chemical conversion, a coil was inserted in the electric circuit then a catalyst was placed in the plasma area. Results showed an improvement of NOx removal by an increase in radical species produced and synergistic effect, respectively.

► Non-thermal surface plasma discharge in wet conditions for gas exhaust treatment is investigated.
► Several parameters are tested such as voltage-frequency, coil and catalyst.
► The removal of NOx is higher with the variation of waveform frequency rather than the applied voltage.
►  Inductance enhances the NOx remediation efficiency and reduces the power consumed in the case of the voltage variation.
► γ-Al2O3 enables a synergetic effect with plasma discharge mainly on the NO2 oxidation.