SMuK 2021 – wissenschaftliches Programm

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P: Fachverband Plasmaphysik

P 5: Poster I

P 5.12: Poster

Dienstag, 31. August 2021, 14:00–16:00, P

Electrical characteristics of a coaxial dielectric barrier discharge for CO2 splitting at elevated pressure — •Rezvan Hosseini Rad, Milko Schiorlin, Michael Schmidt, Volker Brüser, and Ronny Brandenburg — Leibniz Institute for plasma science and technology, Greifswald, Germany

CO2 splitting using nonthermal plasmas is investigated for CO2 utilisation into valuable chemical compounds like methanol. In this work, an asymmetric, coaxial dielectric barrier discharge reactor for CO2 decomposition into CO is investigated. Beside the operation at atmospheric pressure, the effect of an increase up to 1.6 bar is studied. At first, the operation parameters for a full discharging in the reactor has to be carried out to keep the operating voltage amplitude moderate (below 10 kV) at elevated pressures. So, the electrical characteristics of the plasma reactor with three different inner electrode materials (stainless steel, copper, and aluminium) and with the addition of argon as an inert, electropositive gas with lower breakdown voltage than CO2 are studied in detail, and correlated with the CO formation. The discharge power, effective capacity, burning voltage, and area fraction covered by plasma in the reactor are determined by voltage-charge plots. The addition of Ar to CO2 (ratio Ar:CO2 =4:1) reduces the sustaining voltage and enables full plasma coverage in the reactor with voltage amplitudes below 10 kV even at the highest pressure. Increasing pressure or decreasing the argon admixture decreases the current peaks intensity as well as the discharge power. Stainless steel shows higher CO2 conversion, but copper shows higher CO generation.