par Britun, Nikolay;Silva, Tiago;Chen, Guoxing 
;Godfroid, Thomas;van der Mullen, Joost J A M;Snyders, Rony
Référence Journal of physics. D, Applied physics, 51, 14, 144002
Publication Publié, 2018-03
;Godfroid, Thomas;van der Mullen, Joost J A M;Snyders, RonyRéférence Journal of physics. D, Applied physics, 51, 14, 144002
Publication Publié, 2018-03
Article révisé par les pairs
| Résumé : | Significant improvement in the energy efficiency of plasma-assisted CO2 conversion is achieved with applied power modulation in a surfaguide microwave discharge. The obtained values of CO2 conversion and energy efficiency are, respectively, 0.23 and 0.33 for a 0.95 CO2 + 0.05 N2 gas mixture. Analysis of the energy relaxation mechanisms shows that power modulation can potentially affect the vibrational-translational energy exchange in plasma. In our case, however, this mechanism does not play a major role, likely due to the low degree of plasma non-equilibrium in the considered pressure range. Instead, the gas residence time in the discharge active zone together with plasma pulse duration are found to be the main factors affecting the CO2 conversion efficiency at low plasma pulse repetition rates. This effect is confirmed experimentally by the in situ time-resolved two-photon absorption laser-induced fluorescence measurements of CO molecular density produced in the discharge as a result of CO2 decomposition. |
