München 2019 – scientific programme

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P: Fachverband Plasmaphysik

P 9: Atmospheric Pressure Plasmas II - Helmholtz Graduate School III

P 9.4: Talk

Tuesday, March 19, 2019, 12:00–12:15, HS 21

Influence of a catalyst on CO₂ dissociation in a non-equilibrium atmospheric pressure helium plasma jet — •Theresa Urbanietz, Steffen Schüttler, Christoph Stewig, Marc Böke, Volker Schulz-von-der-Gathen, and Achim von Keudell — Experimental Physics II, Ruhr-University Bochum, 44780 Bochum

Excitation of CO₂ in an atmospheric pressure plasma may be an energy efficient method to generate solar fuels from renewable energies. The non-equilibrium excitation of specific states of the molecules in the plasma can cause of high energy efficiency. The influence of a catalyst can even enhance the energy and dissociation efficiency. The dissociation of CO₂ in an atmospheric helium RF plasma jet in the presence of a catalyst is analyzed for varying absorbed plasma powers and compared with measurements without catalyst. Fourier transform infrared spectroscopy is used to evaluate the concentration of CO₂ and CO as well as the rotational and vibrational temperature of the species. A strong non-equilibrium excitation of CO₂ and CO with rotational temperatures around 400 K and vibrational temperatures up to 1600 K has been found. The dependence of these excitation temperatures on the plasma power is rather weak.