Real‐time measurement of axial temperature in a coaxial dielectric barrier discharge reactor and synergistic effect evaluation for in‐plasma catalytic CO2 reduction

Abstract

AbstractDue to serious difficulty in the measurement of catalyst‐bed temperature (Tb) for in‐plasma catalysis (IPC), the evaluation of the IPC synergistic effect is still disputed. Herein, we reported a real‐time measurement of axial temperature (Tax), which is much closer to Tb than wall temperature (Tw), using a thermocouple in a catalyst‐packed coaxial dielectric barrier discharge reactor for the first time. In plasma catalytic CO2 reduction, the effects of discharge power and flow rate on Tax, Tw, and CO2 conversion were examined. On the basis of Tax, compared with the thermal catalytic case, the plasma catalytic case only shows a weak synergistic effect. It was confirmed that the synergistic effect is overestimated if based on Tw (except for the heat‐insulated or quasi‐adiabatic reactors).