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P: Fachverband Plasmaphysik

P 5: Poster I

P 5.11: Poster

Dienstag, 31. August 2021, 14:00–16:00, P

Quenching microwave plasmas via gas injection into the effluent: Effects on the conversion of CO₂ — •Christian Karl Kiefer¹, Ante Hecimovic¹, Federico Antonio D’Isa¹, and Ursel Fantz^1,2 — ¹Max-Planck-Institut für Plasmaphysik, 85748 Garching, Germany — ²University of Augsburg, 86159 Augsburg, Germany

Negative-emissions technologies are required to reach the goal of the Paris Agreement that limits the global mean temperature increase to a maximum of 1.5^∘C. A plasma torch powered by 2.45 GHz microwaves offers a unique possibility to be used as a power-to-gas technology and thermally dissociate CO₂ into carbon monoxide and oxygen at high energy efficiencies. Very fast cooling of the plasma is essential to prevent recombination reactions towards CO₂, thereby maintaining the degree of conversion. For this purpose, an extension for the microwave plasma torch was developed that allows one to inject colder (room temperature) gases into the effluent of the plasma via four radial gas inlets. Experiments with atomic (He or Ar) as well as molecular (N₂ or CO₂) gas admixture were performed in the pressure range of 100 mbar up to atmospheric pressure, covering regimes of diffuse plasma as well as regimes of contracted plasma. The conversion of CO₂ was measured by the application of a mass spectrometer. To further characterize the setup, optical emission spectroscopy was used to determine the rotational and vibrational temperatures of the plasma.