München 2019 – wissenschaftliches Programm
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 (Trot, Tvib) determined from the emission of the C2 (d3Πg state) is discussed.