The Effect of TiO2 Catalyst on the NO Reduction by Barrier Discharge in Nitrogen

The study investigated NO reduction by N radicals produced by barrier discharge in nitrogen and the possible effect of TiO 2 catalyst on this reaction. The experiments for NO reduction were carried out at temperatures ranging from room temperature to 140 °C and at NO concentrations ranging from 200 to 800 ppm. The experimental results were described by a model which was based on six main reactions for the calculation of the NO and NO 2 concentrations. The analysis of model suggested two simple methods for the estimation of nitrogen radical production efficiency which in present study was 2 ppm/(J/L). The model also confirmed that N radicals are used very efficiently in the reduction of NO and this process can’t be improved by the catalyst. Nonetheless, experiments showed that the presence of TiO 2 catalyst improved the removal of NO. The experimental results can be explained by surface processes taking place with NO 2 with the help of other plasma produced nitrogen species.