Speaker
Description
Nonthermal plasmas are one option for a plasma-based conversion of carbon dioxide (CO2) by using intermittent renewable energy for new power-to-X approaches [1]. This contribution will compare the CO2 splitting in barrier discharges and glidings arc. Barrier discharges are probably more robust and enable direct combination with catalysts while gliding arcs show a better energy efficiency.
This lecture attempts to evaluate how the energy yield (EY) of carbon monoxide (CO), a component of the chemical feedstock syngas, can be improved by the parameters of barrier discharge and gliding arc reactors. Planar and coaxial volume barrier discharges as well as packed bed reactors are studied. Special attention is given to the electrical characterization of the discharges by means of voltage-charge plots (often referred as Lissajous-figures) or voltage-current measurements, both interpreted based on equivalent circuits [2]. The role of the specific input energy, SIE, a microscopically and macroscopically defined parameter governing the energy transfer by the electric field to the molecules via inelastic collisions [3], is discussed. Similar as in [4], the CO formation in the barrier discharges scales with the total number of charges being transferred through the discharge during the residence time of the gas. The effects of gas composition, pressure and bed material on the electrical parameters (e.g. discharge voltage and power) and on the CO2-splitting are also planned to be discussed in detail in the lecture.
Acknowledgments
This research was funded by German Federal Ministry of Education and Research (BMBF) under grants 03WIR4905A and 033RC030D and European Union—NextGenerationEU.
References
[1] A. Bogaerts and G. Centi, Front. Energy Res. 8, 111 (2020).
[2] R. Brandenburg, M. Schiorlin, M. Schmidt,
H. Höft, A.V. Pipa, V. Brüser, Plasma, 1, 1–20 (2023).
[3] D. Hegemann, Plasma Processes and Polymers, 20, e2300010 (2023).
[4] F. Brehmer, S. Welzel, M.C.M. van de Sanden, R. Engeln, Journal of Applied Physics, 116, 123303 (2014).
