Göttingen 2025 – wissenschaftliches Programm

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P: Fachverband Plasmaphysik

P 21: Atmospheric Plasmas and their Applications V

P 21.6: Vortrag

Donnerstag, 3. April 2025, 15:30–15:45, ZHG006

N-butane conversion in an RF plasma combined with a catalyst — •Fatma-Nur Seferoglu¹, Steijn Vervloedt², and Achim von Keudell² — ¹Institute of Fusion Energy and Nuclear Waste Management, Forschungszentrum Jülich GmbH, Jülich, GERMANY — ²Experimental Physics II, Ruhr-University, Bochum, GERMANY

Volatile organic compounds (VOCs) such as n-butane can negatively impact the environment, contribute to air pollution and can affect human health. Plasma catalytic systems are a promising technology for VOC removal. These systems, particularly in-plasma catalysis, can be very complex due to numerous chemical and physical processes that can take place simultaneously. Recently, different reaction kinetic models for the plasma-assisted conversion of n-butane have been proposed. However, the key reaction channels are still not fully known yet. In this work, a capacitively coupled plasma is generated at 13.56 MHz in atmospheric pressure between two plane-parallel electrodes spray-coated with MnO₂ as a catalyst. Fourier-Transform Infrared spectroscopy has been performed for a helium flow of 250 sccm and two different gas admixtures O₂: C₄H₁₀: He = 0.135%: 0.124%: 99.741%, and CO₂: He = 0.81%, to determine the species concentration inside the plasma-catalytic system. The comparison between the experiment and the proposed models reveals that O₂ adsorption is less dominant than CO₂ adsorption on the catalytic surface in the case of the oxygen-deficient n-butane conversion. In all cases, electron-impact CO₂ dissociation plays a mayor role in the plasma-catalytic system.

Keywords: plasma catalysis; n-butane conversion; FTIR spectroscopy; RF plasma; capacitively coupled plasma