Hannover 2020 – scientific programme

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P: Fachverband Plasmaphysik

P 16: Poster Session 3

P 16.16: Poster

Wednesday, March 11, 2020, 16:30–18:30, Empore Lichthof

Excitation and dissociation of CO₂ heavily diluted in noble gas atmospheric pressure plasmas — •Christoph Stewig, Theresa Urbanietz, Steffen Schüttler, Volker Schulz-von-der-Gathen, Marc Böke, and Achim von Keudell — Experimental Physics II, RUB, Bochum, Germany

The storage of renewable energies into chemical fuels due to the dissociation of CO₂ has been an inspiring idea for years. Hereby, non-equilibrium plasmas may be a promising candidate, as they allow dissociation reactions without the necessity of high temperatures. The vibrational pumping of the CO₂ due to repeated collisions with energetic plasma compounds is one of the discussed reaction channels.

Utilizing an atmospheric RF driven plasma jet, the dissociation efficiency of CO₂ has been investigated. Helium, argon and different helium-argon admixtures where used as carrier gases for the discharge. As expected, argon leads to a much higher conversion efficiency and lower specific energy inputs (SEI) for dissociation. However, only a small admixture of argon to a helium plasma changes the conversion characteristics of said plasma to an argon-like behaviour, whereas the vibrational temperatures of CO₂ remain unchanged. This points towards a direct dissociation process instead of vibrational pumping prior to dissociation.