Mainz 2022 – wissenschaftliches Programm

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P: Fachverband Plasmaphysik

P 21: Atmospheric Pressure Plasmas II

P 21.7: Vortrag

Freitag, 1. April 2022, 15:30–15:45, P-H11

CO2 conversion in a barrier corona discharge at elevated pressures — •Hamed Mahdikia, Volker Brüser, and Ronny Brandenburg — Leibniz Institute for Plasma Science and Technology, 17489, Greifswald, Germany

A barrier corona discharge in CO2 with admixture of Argon is studied. The aim is to investigate the operation at elevated pressures up to 5 bar for industrial scale CO2 conversion. Therefore, the coaxial asymmetric dielectric barrier discharge contains an inner brush electrode to intensify the electric field strength and to minimize the amplitude of the applied high voltage driving the discharge. Charge-voltage plots are used to characterize the discharge. Depending on the conditions (sinusoidal voltage amplitude, gas composition and pressure), full or partial coverage of the electrodes is obtained. This so-called partial discharging is monitored by the variation of the effective dielectric capacitance. Optical emission spectroscopy was done at full coverage condition for each gas composition and pressure. The line intensity ratio of atomic oxygen at 777 nm to Argon excited species at 772 nm increase significantly by increasing the pressure. On the other hand, absolute CO2 conversion decreases by increasing the CO2 content in the gas mixture and pressure at constant specific energy input (SEI=1.5 kJ/L) while effective conversion increases as well as the energy efficiency, and CO production. A correlation of the mean reduced electric field strength (E/N) and the CO2 dissociation is found. The E/N decreased by increasing the pressure and sustaining voltage to ~ 40 Td for 5 bar which leads to a higher dissociation degree.