Experimental Study on Non-equilibrium Plasma-catalyzed Reverse Water-gas Shift Reaction for CO₂ Hydrogenation

This study employs a non-equilibrium plasma discharge technology combined with Cu-based catalysts to enhance the low-temperature efficiency of CO₂ hydrogenation via the reverse water-gas shift (RWGS) reaction. The experiment compared and analyzed the effects of catalysis, plasma, and their synergistic effects on CO₂ conversion performance, focusing on the effects of plasma discharge voltage, gas flow rate, CO₂ and H₂ ratio, circulating water temperature on CO₂ conversion rate and CO selectivity, as well as SEI values and energy efficiency under different conditions. The results showed that the synergistic effect of plasma discharge and catalyst was significant. At a discharge voltage of 16 kV, gas flow rate of 20 mL/min, CO₂:H₂=1:3, and circulating water temperature of 80℃, the conversion rate of CO₂ reached 79.17%, and the selectivity of CO reached 50.83%. Under high flow conditions with CO₂:H₂ ratios of 1:1 or 1:2, and 60−90 mL/min, the energy efficiency is relatively high, reaching up to 208.47 µmol/kJ.