Greifswald 2024 – scientific programme

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P: Fachverband Plasmaphysik

P 6: Poster I

P 6.7: Poster

Monday, February 26, 2024, 16:30–18:30, ELP 6: Foyer

Experimental studies on H₂ addition to a CO₂ atmospheric microwave plasma torch — •Marc Bresser, Sophie Wahl, Katharina Wiegers, Andreas Schulz, Matthias Walker, and Günter Tovar — IGVP, University of Stuttgart, Germany

Man-made climate change, caused for example by an increased concentration of carbon dioxide (CO₂) in the atmosphere, is causing a switch from fossil fuels to renewable energy sources. The chemical industry is searching for new renewable ways to synthesize hydrocarbons. One way is to utilize the resulting CO₂ as a reactant and create a cycle process. CO₂ can be activated by a microwave plasma and split into carbon monoxide (CO) and oxygen (O₂). The big advantage is, that this technology enables the use of intermittent energy from wind and sun. The resulting CO can be further processed into hydrocarbons. One idea is to add other gases to the CO₂ plasma in order to utilize the energy and produce higher value products. In this work, the addition of "green" hydrogen (H₂) to a CO₂ plasma is investigated. The CO₂ gas is introduced tangentially in a reverse vortex flow of a microwave plasma torch. On top of the plasma torch a 13 mm restriction nozzle is mounted to quench the plasma and prevent the reverse reaction. The position of the H₂ addition is varied. After cooling to room temperature, the product gas is analyzed using a Fourier transform infrared (FTIR) absorption spectrometer. The influence of microwave power, gas flow and gas composition on the product gas is studied.

Keywords: CO2 conversion; Microwave plasma torch; hydrogen