Nitrogen Oxides Reduction by Using Cold Plasma Discharge (Réduction des Oxydes d'azote par Plasma Froid de Décharge)
| dc.contributor.author | LABDOUNI, Nesrine | |
| dc.date.accessioned | 2026-05-26T08:38:50Z | |
| dc.date.available | 2026-05-26T08:38:50Z | |
| dc.date.issued | 2026 | |
| dc.description | THESIS Submitted in fulfillment of the requirements for the degree of DOCTORATE (LMD) Field: Electrotechnics Specialty: Electrical Networks | en_US |
| dc.description.abstract | This thesis reports a detailed numerical investigation of nitrogen oxides (NOₓ) mitigation using a dielectric barrier discharge (DBD) reactor operating at atmospheric pressure. The study examines the electrical behavior of the discharge, including voltage–current characteristics, discharge power, and specific energy density, and investigates their relationship with NOₓ removal performance. Simulations were performed for various working gas compositions (69% N₂, 20% O₂, and 1% Ar), and a simulated exhaust gas containing NO, under different operating conditions such as applied voltage(10kV), excitation frequency(3kHz), and NO flow rate. The numerical model was developed and implemented using COMSOL Multiphysics to analyze the coupled plasma dynamics and chemical kinetics involved in the discharge process. Particular attention is given to the temporal development of micro-discharges in order to elucidate the plasma-chemical pathways responsible for the generation of reactive species, including atomic oxygen, ozone, and electronically excited molecules of nitrogen and oxygen. These species are shown to govern the oxidation of NO and its subsequent transformation into NO₂, N₂O₅, and other less hazardous nitrogen compounds. The simulations were carried out for atmosphericpressure gas mixtures composed of N₂, O₂, Ar, and NO under optimized operating conditions. The results indicate that higher applied voltages, combined with the presence of low oxygen fractions, markedly increase the formation of oxidative radicals, thereby improving NO conversion efficiency. In addition, the effect of argon admixture is analyzed, revealing its role in enhancing electron-impact processes and discharge homogeneity, which in turn leads to improved plasma reactivity. The obtained results demonstrate a NO reduction efficiency reaching approximately 99% under optimal operating conditions, confirming the strong potential of DBD plasma technology for air pollution control. The energetic performance of the process is evaluated to assess its suitability for large-scale implementation. Overall, the outcomes confirm that non-thermal plasma generated by DBD reactors constitutes an effective, energy-efficient, and environmentally sustainable approach for NOₓ reduction. The reactor demonstrates significant removal efficiencies, underscoring its potential for advanced air purification. Finally, strategies for reactor optimization and prospects for coupling DBD technology with catalytic systems are discussed. | en_US |
| dc.identifier.uri | http://dspace.univ-chlef.dz/handle/123456789/2449 | |
| dc.publisher | Djilali BENYOUCEF | en_US |
| dc.subject | Cold plasma | en_US |
| dc.subject | Dielectric barrier discharge (DBD) | en_US |
| dc.subject | Nitrogen oxides (NOₓ) | en_US |
| dc.title | Nitrogen Oxides Reduction by Using Cold Plasma Discharge (Réduction des Oxydes d'azote par Plasma Froid de Décharge) | en_US |
| dc.type | Thesis | en_US |