Erlangen 2018 – wissenschaftliches Programm

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P: Fachverband Plasmaphysik

P 4: Atmospheric Pressure Plasmas I

P 4.7: Vortrag

Montag, 5. März 2018, 15:45–16:00, KI 1.174

CO₂ dissociation in non-equilibrium atmospheric pressure plasmas — •Theresa Urbanietz, Sarah-Johanna Klose, and Achim von Keudell — Institut für Experimentalphysik II, Ruhr-Universiät Bochum, 44780 Bochum

The reduction of greenhouse gases such as CO₂ and CH₄ has gained a lot of interest in the last years. The conversion of CO₂ in a plasma can be used to produce useful chemicals and fuels such as syngas. The dissociation of CO₂ in a He/CO₂ atmospheric pressure plasma has been studied by in-situ Fourier Transform Infrared (FTIR) spectroscopy. For optimal investigation a plasma source is designed that allows to perform FTIR spectroscopy directly inside the plasma volume. The plasma volume is confined by potassium bromide (KBr) windows for measurements perpendicular and along the gas flow. For a detailed analysis of the FTIR spectra a reference spectrum is modelled using the HiTRAN database and compared to the measured spectra. This gives information about the vibrational and rotational temperature of the species as well as the concentration of the species. A variation of CO₂ admixture and power shows conversation rates up to 20% and energy efficiencies up to 30%. The vibrational temperature of CO is around 1300K whereas the rotational temperature stays nearly at room temperature. Inside the plasma volume a catalyst can be placed to investigate its performance and influence on the plasma. First results with nickel oxide catalysts on silica show a clear increase in the conversation rate.