Simultaneous Oxidization of NO_x and SO₂ by a New Non-thermal Plasma Reactor Enhanced by Catalyst and Additive

Abstract

The non-thermal plasma as one of the most promising technologies for removing NOx and SO2 has attracted much attention. In this study, a new plasma reactor combined with catalyst and additive was developed to effectively oxidize and remove NOx and SO2 in the flue gas. The experimental results showed that TiO2 could improve the oxidation efficiency of SO2 in the case of applying plasma while having a negative effect on the oxidation process of NO and NOx. With the addition of NH3, the oxidation rates of NOx, NO and SO2 were slightly increased. However, the effect of adding NH3 on NOx oxidation was negative when the temperature was above 200 o C.

Development of Catalyst-Sorbents for Simultaneous Removal of SO2From Flue Gas by Low Temperature Ozone Oxidation

“…To overcome this dilemma, the exploitations of new plasma generation method, designing of new reactor types, associating with heterogeneous catalysts etc. are considered meanwhile (Huang et al, 2007;Jun et al, 2008;Kim et al, 2008).…”

NO Conversion by Dielectric Barrier Discharge and TiO2 Catalyst: Effect of Oxygen

“…Some attempts to improve the conversion efficiency of NO are made using TiO 2 inside the dielectric barrier discharge (DBD) reactor but the results are contradictory [10][11][12][13]. In some studies [10][11][12], the presence of TiO 2 clearly improved the conversion of NO whereas in one study [13] the effect of TiO 2 was unfavorable.…”

“…In some studies [10][11][12], the presence of TiO 2 clearly improved the conversion of NO whereas in one study [13] the effect of TiO 2 was unfavorable. As the experimental conditions (reactor temperature, gas composition, reactor design and specific input energy) differed considerably in above-mentioned studies, it is hard to explain the discrepancies of these results.…”

“…To clarify the effect of O atoms adsorbed on the TiO 2 surface, the experiments were carried out without the presence of H 2 O. Previous studies [10][11][12][13] used only fixed concentration of O 2 and NO, whereas in the present study the concentrations of these species were varied in a wide range. Finally, the efficiency of the NO conversion was investigated for different gas compositions as a function of the input energy density.…”

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

“…In the case of plasma, NO 2 can be further oxidized to NO 3 and finally to N 2 O 5 [3,4]. It has been reported that the simultaneous action of DBD and TiO 2 coating inside the reactor decreases in the outlet both NO and NO x concentrations [9][10][11][12]. In these studies only NO and NO 2 concentrations were measured and it was not clear whether NO x was adsorbed on the TiO 2 surface, oxidized to NO 3 and N 2 O 5 or reduced to N 2 and O 2 .…”