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P: Fachverband Plasmaphysik

P 21: Atmospheric Pressure Plasmas II

P 21.6: Talk

Friday, April 1, 2022, 15:15–15:30, P-H11

CO2 dissociation by a nanosecond pulsed dielectric barrier discharge — •Sepideh Mousazadeh Borghei, Volker Brüser, and Juergen F. Kolb — Leibniz Institute for Plasma Science and Technology (INP), Greifswald, Germany

Reduction of CO2 into value-added chemicals and fuels by means of plasma technology has gain significant interest in recent years. In this project, a coaxial dielectric barrier discharge generated with high voltage pulses of 15-20 kV and a pulse duration of 500 ns at ambient temperature and atmospheric pressure was used to investigate the process of CO2 splitting for CO2 and an admixture of Ar in the ratio of 1:2 (CO2:Ar). The influence of gas flow rate and more importantly the effects of positive and negative polarity on the process of dissociation were investigated. The gaseous product after plasma treatment was analyzed by Fourier transform infrared spectroscopy. The results indicated that gas flow rate plays an important role in the process of dissociation, which the highest CO2 conversion of 5.6% detected for the lowest flow. In addition, positive polarity shows an up to 1.3 fold higher CO concentration compared to negative polarity. Indeed, the obtained results from the inception voltage approved that less voltage was required to start the plasma in positive polarity, and therefore, at the same condition, there are more filamentary channels in positive polarity than negative polarity.