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P: Fachverband Plasmaphysik

P 9: Poster I

P 9.45: Poster

Dienstag, 29. März 2022, 16:00–17:30, P

Hydrogen production in an atmospheric pressure argon methane microwave plasma — •Simon Kreuznacht, Marc Böke, and Achim von Keudell — Experimental Physics II, Ruhr University Bochum, Germany

Hydrogen is an important precursor in the chemical industry and may also serve as energy carrier, for energy storage, or as climate friendly fuel in the future. Today, hydrogen is produced mainly via steam reforming of methane, which emits a lot of CO₂. A promising alternative production method is the pyrolysis of methane in a microwave plasma, as it is an oxygen free technology.
Here, we present the analysis of the product gas stream of such a plasma. The plasma is operated at atmospheric pressure in an argon methane mixture (60 slm total flow rate up to 35 % methane admixture). Microwaves (2.45 GHz up to 6 kW) are used to sustain the plasma. The length of the plasma reaches up to 60 cm with a diameter of about 1.2 cm. In the center of the plasma the gas temperature reaches up to 4200 K. The main products are hydrogen (H₂), ethyne (C₂H₂), ethene (C₂H₄) and solid carbon. The methane conversion increases linearly with the specific energy input per methane molecule (SEI). Increasing the methane admixture at constant SEI leads to an increased methane conversion. Up to 73 % methane conversion and up to 87 % selectivity towards hydrogen are achieved.