Products Yield and Energy Efficiency of Dielectric Barrier Discharge for NO Conversion: Effect of O₂ Content, NO Concentration, and Flow Rate

Abstract

Nonthermal plasma (NTP) used for NO removal has been studied for a long time, but how to achieve the desired product with lower energy consumption is still a barrier for its industrial application. Dielectric barrier discharge (DBD) energized via an AC power supply was used to generate NTP. Energy cost (EC, MJ/mol) and product measurements were performed to reveal the effect of O2 content, NO concentration, flow rate, and specific energy density (SED, J/L) on the performance of DBD. The products (NO, NO2, N2O, and O3) of different SEDs were experimentally measured at 303 ± 2 K. On the basis of the variation of products with the change in SED, the possible dominant plasma reaction and corresponding species were discussed. The dominant reaction of DBD processes can be categorized into oxidation, reduction, and product reactions with increasing SED from 400 to 3500 J/L. Lower SED and higher O2 content are beneficial for the conversion of NO to NO2 and O2 to O3. The O atoms and temperature play a significant role in the interconversion of NO and NO2. A limitless increase in SED will reduce the conversion of both NO to NO2 and NO to N2 due to the product’s reaction with O and N atoms, respectively. The N2O was observed in all DBD systems with the feeding of N2/O2.

Influence mechanism of different precursors on the adsorption behavior of NOx over Cu2+ ion‐exchange ZSM‐5

“…The concentrations of NOx (NO 2 , N 2 O and NO) were analyzed simultaneously by a Thermo Fisher Scientific Nicolet iS50 Fourier‐transform infrared (FT‐IR) spectrometer. According to previous studies, when the concentration of NOx reached 200 ppm, it was regarded as adsorption penetration, at which point the adsorption was stopped, the time of adsorption was recorded and then entered the next stage.…”

“…found that in the A‐NTP‐C decomposition system, adsorption capacity of the adsorbent plays an important role. The authors' previous studies also have indicated that good adsorption capacity of the catalyst means better discharge performance in the process of NTP‐assisted catalytic NOx decomposition, that is, the conversion of NO is higher. Therefore, more attention should be paid to improvement of the adsorption capacity of catalysts.…”

Effect of Gas Components and Particulate Matter on the Conversion of Nitric Oxide by Dielectric Barrier Discharge

“…4−7 The DBD area is larger and more stable, which is the optimal plasma generation technique. 8 On the other hand, the main reason for the low removal efficiency of NO x is that the chemical activity of NO is low, which accounts for more than 90% of NO x . The conversion of NO by NTP can be divided into reduction and oxidation.…”

“…12 To sum up, the coexistence of different radicals generated by these components makes the conversion of NO more complicated. 8,13,14 In recent years, the conversion of NO by NTP has been widely studied. 15,16 The performance of pulsed corona and DBD to remove NO has been demonstrated.…”

Plasma-induced catalysis: towards a numerical approach

“…To better understand the interplay of plasma, flow and the geometry of the packing structure, experiments were carried out in the past. For example, Wang et al [1] studied the reaction performance of a dielectric barrier discharge (DBD) plasma reactor by varying the inflow parameters, Wang et al [2] studied the energy efficiency of the DBD reactor for a series of specific reactions, and Sahki et al [3] studied the pressure effect on a reaction with different catalysts. As direct measurements can be costly and difficult to perform, numerical methods are particularly attractive.…”