Numerical Simulation of NO Oxidation in Dielectric Barrier Discharge with Microdischarge Formation

Abstract

In this work, we developed a simulation model for plasma-enhanced chemical reaction in dielectric barrier discharge (DBD) in consideration of filamentary microdischarge formation. The first stage is the calculation of single filamentary microdischarge developed in DBD with parallel plate geometry using the fluid model. The second stage is the calculation of chemical processes with a set of rate equations using the radical production yield obtained in the filamentary microdischarge calculation. This model was applied to the NO oxidation process, which is often important in NO x removal using gas discharges, in atmospheric pressure N 2 /O 2 /NO mixtures under various discharge conditions. The calculated NO oxidation property has a quantitatively good agreement with the experimental one under wide discharge conditions. Therefore, the method used in this work is valid for the prediction of chemical processes in DBD. We also discuss the effect of gas temperature and gas residence time on NO oxidation.

Atmospheric Pressure Plasma Treatment and Following Aging Effect of Chromium Surfaces

“…When plasma treatment is done in air at atmospheric pressure, the influence of humidity on the treatment efficiency should be taken into careful account. The plasma chemistry of humid air for the dielectric barrier discharges (DBDs) was studied in detail by few research groups [16,17]. Note that in humid air plasma the -NO x radicals are generated in plasma volume (as an intermediate products).…”

Effects of ambient air on the characteristics of an atmospheric-pressure plasma jet of a gas mixture of highly N2-diluted O2on a sliding substrate

“…Our present model, however, assumes spatially uniform discharge between the electrodes because the simulation of 2D or 3D filamentary discharges requires a very long computation time. [20][21][22] In the case of filamentary discharges, electron collision dissociation of molecules occurs only at the positions where filamentary discharge occurs. In other positions, the source gas passes through without being affected by electron collisions.…”

“…Under such a condition, we can neglect the effect of additional species on the EEDF. 21) Thus, we have assumed that EEDF in the DBD region is governed only by the parent molecules N 2 and O 2 .…”

Experimental study of NO2 reduction in N2/Ar and O2/Ar mixtures by pulsed corona discharge

“…Once N and O radicals formed, the most accepted mechanisms of NO 2 conversion to NO in plasma in the reactor are listed as follows (Arai et al, 2004;Herron, 1999;Tochikubo et al, 2009;Yan et al, 1999):…”