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P: Fachverband Plasmaphysik

P 19: Helmholtz Graduate School 4 and Magnetic confinement 4

P 19.1: Vortrag

Donnerstag, 12. März 2020, 11:00–11:25, b305

CO₂ Dissociation from low to high pressure in plasma torch and surfaguide — •Federico Antonio D’Isa, Clemént Brochet, Ante Hecimovic, Emile Carbone, and Ursel Fantz — Max-Planck-institut für Plasmaphysik, BoltzmannStr. 2, 85748 Garching

The power to gas technology aims to store excess energy into gas by conversion of CO₂ into chemical fuels to reduce the CO₂ produced from the transportation sector. One step of the green-fuels production process consists in the dissociation of CO₂ into CO. In this work the dissociation of CO₂ into CO is investigated in a 2.45 GHz microwave plasma torch and a 2.45 GHz surfaguide. The two plasma sources are studied in the pressure range from 5-1000 mbar (surfaguide 5-60 mbar, plasma torch 60-1000 mbar). The gas temperature is found to increase from 1400 K to 3000 K with pressure in the range between 5-60 mbar and no significand differences are found between the two setups. The CO₂ conversion is found to be comparable in the two setups when the same power, pressure and input flow are used. In the plasma torch, above circa 120 mbar, a sudden transition from a radially di*use to a contracted plasma regime is reported. The latter is accompanied by a sharp increase of gas temperature from 3000 K to 6000 K in the plasma core. The CO₂ dissociation is strongly influenced by the discharge parameters, exhibiting peak values in the 100-200 mbar range, and usually increase with power. The measured CO₂ conversion and energy efficiency are compared to the conversion expected for a hot CO₂ gas at thermal equilibrium.