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P: Fachverband Plasmaphysik

P 21: Atmospheric Pressure Plasmas II

P 21.3: Talk

Friday, April 1, 2022, 14:30–14:45, P-H11

Plasma catalytic synergies of a non-equilibrium atmospheric pressure plasma jet with MnO₂ surface catalyst — •Christoph Stewig, Theresa Urbanietz, Laura Chauvet, Marc Böke, and Achim von Keudell — Ruhr-Universität Bochum Institute of Experimental Physics II Faculty for Physics and Astronomy Universitätsstraße 150 Building NB 5/174 D-44780 Bochum

Plasma catalysis seeks to exploit potential synergies between surface catalytic reactions and plasma reactions. An excess of renewable energies could be used to produce value-added molecules and thus provide the chemical industry with important reactants or allow for alternative methods of energy storage.

Potential synergetic effects are: (i) a reduction or prevention of catalyst poisoning due to a cleaning of the catalyst surface, hence (ii) a lowering of the catalyst activation temperature, and (iii) an increase in the catalyst activity due to the creation of additional reactive sites by the plasma. (iv) finally, specific molecular excitations could promote specific surface reactions.

We investigate these mechanisms in a RF driven temperature-controlled capacity coupled plasma jet at atmospheric pressure. Fourier Transformed Infrared Spectroscopy (FTIR) measurements are conducted in the plasma and yield information on the excitation and density of noble gas diluted molecules like CO₂ or n-butane.

The effect of a MnO₂ surface catalyst for temperatures of 20^∘C and 200^∘C on the dissociation of n-butan are presented.