Time-resolved laser-induced fluorescence study of NO removal plasma technology in N₂/NO mixtures

Abstract

The laser-induced fluorescence technique is used to study NO removal in N 2 /NO mixtures, after excitation by a homogeneous photo-triggered discharge. Time-resolved experiments are performed in the decaying post-discharge in order to measure the NO concentration 200 µs after a 75 ns duration current pulse. For the first time the NO removal is measured for a single current pulse excitation of the polluted mixture near atmospheric pressure. We discuss the influence of both the electrical energy deposited in the discharge and the initially applied reduced electric field on the NO removal efficiency. It is shown that near 100% of the initial NO molecules can be removed with a single shot, depending on experimental conditions. A detailed kinetic analysis is performed, which leads to straightforward analytical approach used to estimate the N atom density produced by the discharge as a function of the electrical parameters values. It strengthens that, with regard to known kinetic processes, the ideal case for 100% NO removal is to create the exact number of N atoms corresponding to the number of NO molecules, at the lowest energetic cost.

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

“…[5] is small and it was not considered. The oxidation of NO to NO 2 proceeds until NO is totally removed and thus there appear only NO 2 , N 2 O 5 and O 3 in the outlet.…”

“…Non-thermal plasma sources, such as corona discharge or dielectric barrier discharge (DBD) are considered as an efficient method for the treatment of NO x [1][2][3][4][5][6]. Another possibility for the treatment of NO x is to use photocatalysts, such as TiO 2 [6][7][8].…”

LIF spectroscopy applied to the study of non-thermal plasmas for atmospheric pollutant abatement

“…The deposited energy in the discharge ranges from 1.1 up to 4.6 J. Details of the time resolved measurement technique in the afterglow have been previously published [35]. We use a Datachrom 5000 system from Quantel including a tunable dye laser TDL50 pumped by a pulsed Nd:Yag laser.…”

“…In this section we will focus on the contribution of the LIF diagnostic, applied to the photo-triggered discharge, to the understanding of the plasma kinetic [29][30][31][32][33][34][35]. Let us examine first the case of the NO molecule.…”

Laser-Induced Fluorescence (LIF) Probe for In-situ Nitric Oxide Concentration Measurement in a Non-thermal Pulsed Corona Discharge Plasma Reactor

“…Here, k 0 is the pseudo second-order rate constant at a low-pressure limit and k ∞ is the second-order rate constant at a high-pressure limit, and log = log 10 . Fc is function of temperature, and is equal to 0.85 at 300 K. 13 Atkinson et al (20) 13 Atkinson et al (21) 12 Atkinson et al (20) 6.…”