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P: Fachverband Plasmaphysik

P 7: Atmospheric Pressure Plasmas I

P 7.6: Talk

Tuesday, March 29, 2022, 15:15–15:30, P-H11

CO₂ conversion in barrier discharges with and without packed bed filling at elevated pressures — •Rezvan Hosseini Rad¹, Milko Schiorlin¹, Volker Brüser¹, and Ronny Brandenburg^1,2 — ¹Leibniz-Institute for Plasma Science and Technology — ²University of Rostock, Institute of Physics

A coaxial dielectric barrier discharge (DBD) reactor operated at elevated pressures up to 2 bar is investigated for the splitting of carbon dioxide. Electrical plasma parameters as well as concentraions of carbon monoxide as the main chemical product is studied without and with a packed bed (partially or fully) filling the reactors volume. A mixture Ar:CO₂ = 4:1 is used as feed gas. Argon is admixed in order to reduce the breakdown voltage, thus, enabling also a stable plasma operation at the higher pressures. Increasing the pressure leads to an increase of the CO₂ conversion and energy efficiency in case of empty as well as packed bed reactor. The energy efficiency is improved up to 31 % if the reactors volume is fully filled with glass beads with a CeO₂ coating compared with the empty reactor. The chemical performance is correlated with the discharge distribution in the DBD reactor, deduced from electrical diagnostics.