Doctorat en Electronique et Électrotechnique

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Browsing Doctorat en Electronique et Électrotechnique by Subject "Argon admixture"

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    Carbon Dioxide Treatment Using Electrical Discharges
    (Toufik TAHRI / Hocine TEBANI, 2026-04-28) Mohamed CHENOUI
    This thesis investigates the application of non-thermal dielectric barrier discharge (DBD) plasma for the conversion of carbon dioxide (CO₂) at atmospheric pressure, with the objective of improving CO₂ activation and conversion efficiency under controlled operating conditions. Nonthermal plasmas offer a promising alternative to conventional thermal processes by enabling efficient energy transfer to electrons while maintaining low gas temperatures, thereby favoring selective chemical reactions. A self-consistent plasma model is developed to describe the electrical and physicochemical behavior of CO₂/Ar DBD discharges. The model accounts for electron kinetics, plasma chemistry, charge transport, and electric field evolution within the reactor.Particular attention is given to the role of gas composition and dielectric properties in shaping discharge dynamics and stability. The influence of key operating parameters, including applied voltage, excitation frequency, gas pressure, argon concentration, and dielectric material characteristics, is systematically analyzed through numerical simulations. The results demonstrate that the addition of argon significantly enhances electron density and promotes more stable discharge behavior by reducing the breakdown voltage and facilitating electron impact processes. Optimal CO₂ conversion performance is obtained at intermediate excitation frequencies and applied voltages, where a balance between discharge intensity and stability is achieved. In contrast, increasing the gas pressure leads to reduced conversion efficiency due to enhanced collisional losses and reduced electron mean free path. The simulated electrical characteristics and plasma behavior show good agreement with experimental observations, validating the reliability of the proposed model. Overall, this work provides valuable insights into the mechanisms governing CO₂ activation in DBD plasmas and highlights the importance of operating parameter optimization for the development of efficient plasma-based CO₂ conversion and environmental technologies.