Mainz 2022 – scientific programme

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P: Fachverband Plasmaphysik

P 19: Poster II

P 19.47: Poster

Thursday, March 31, 2022, 16:00–17:30, P

Comparison of mass spectrometry and optical measurements of plasma catalysis conversion of n-butane — •Laura Chauvet, Christoph Stewig, Theresa Urbanietz, 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

With the progress in the production of renewable energy, the use of plasmas to convert molecules into value added species present a novel research field of interest. The coupling of plasma with a surface catalyst might exhibit synergetic effects enhancing the conversion or the selectivity of reactions.

In this framework, a plasma chamber has been designed to study the mechanisms involved in the conversion of carbon-based molecules by plasma catalysis. The chamber is fed by a helium flow with small admixtures of n-butane. A capacitively coupled atmospheric pressure RF discharge is used to dissociate n-butane. Different kinds of catalysts can be spray coated on the electrodes and brought into contact with the plasma. In this work, a sampling system has been designed to sample the gas directly from the edge of the discharge to perform in situ measurements by mass spectrometry. The measurements are compared to the ones performed by Fourier Transform Infrared Spectroscopy (FTIR) measurements. As mass spectrometry is not limited by infrared active species, it is a complementary method to benchmark the optical measurements.