Erlangen 2026 – scientific programme
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P: Fachverband Plasmaphysik
P 16: Poster Session Plasma Physics
P 16.56: Poster
Thursday, March 19, 2026, 13:45–15:45, Redoutensaal
CO2 Conversion and Oxygen Removal in the Effluent of a Plasma — •Katharina Wiegers1, Thomas Schiestel2, Rodrigo Antunes3, Andreas Schulz1, Matthias Walker1, and Günter Tovar1 — 1University of Stuttgart, Stuttgart, Germany — 2Fraunhofer IGB, Stuttgart, Germany — 3Max-Planck-Institute IPP, Garching b. München, Germany
Plasmas offer a promising pathway for energy-efficient CO2 conversion into CO. However, their performance is strongly influenced by the chemistry in the plasma effluent. Consequently, the suppression of back-reactions is essential, which can be achieved by employing tailored gas nozzle designs. This study investigates how the nozzle geometry enhances CO2 conversion by modifying the effluent flow. A major challenge in CO2 plasma conversion is the formation of oxygen in the product gas, which reduces the efficiency of subsequent reactions. Oxygen-conducting hollow-fiber membranes are employed to selectively extract O2 from the effluent of an atmospheric microwave plasma torch. The influence of microwave power on the temperature distribution in the plasma membrane reactor and the resulting oxygen permeation flux is analyzed. Furthermore, the effect of a nozzle positioned between the plasma and the membrane module is examined; it alters flow and species distribution in the effluent, significantly affecting O2 permeation. Finally, integration of up to 21 hollow-fiber membranes into the effluent stream demonstrates efficient and scalable oxygen removal.
Keywords: CO2 Conversion; O2 Removal; Nozzle; Post-Plasma Quenching