München 2019 – wissenschaftliches Programm

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P: Fachverband Plasmaphysik

P 18: Postersitzung

P 18.110: Poster

Donnerstag, 21. März 2019, 16:30–18:30, Foyer Audimax

Mass spectrometry and OES characterization of a CO2 microwave plasma at atmospheric pressure — •Federico Antonio D’Isa, Ante Hecimovic, Emile Carbone, and Ursel Fantz — Max-Planck-institut für Plasmaphysik, BoltzmannStr. 2, 85748 Garching

On demand energy storage plays a critical role for an energy grid based on renewable energies. The power to gas technology aims to store excess energy into gas by conversion of CO₂ into chemical fuels. One step of the process consists in the dissociation of CO₂ into CO. In this work a CO₂ plasma excited by microwaves in a TM₀₁ cylindrical cavity has been investigated. The plasma was kept at pressure close to atmospheric, while the CO₂ gas flow was varied between 10 slm and 100 slm and microwave power was varied between 900 W and 3000 W. To optimize the CO₂ conversion, the quantification of the energy efficiency and conversion efficiency, and its changes with the plasma parameters such as flow and power, is of critical importance. The CO₂ dissociation has been quantified by sampling the plasma effluent with a capillary and analyzing the gas composition with a mass spectrometer. The necessary pressure drop has been achieved by means of a fixed and a variable orifices connected to an intermediate chamber. The correlation of the conversion and energy efficiency with the rotational and vibrational temperatures (T_rot, T_vib) determined from the emission of the C₂ (d³Π_g state) is discussed.