Facilitating CO₂–CH₄ Reforming Into Syngas and Useful Chemicals by Water‐Cooled Dielectric Barrier Discharge Plasma: Effect of Discharge Power, Gas Mixing, and Mechanism Insight

ABSTRACT CO 2 reforming of CH 4 to syngas (H 2 and CO) has emerged as one of the attractive options for mitigating carbon emissions. Here, a water‐cooled dielectric barrier discharge plasma reactor has been constructed for CO 2 –CH 4 reforming to produce syngas and value‐added chemicals. The effects of the main parameters (i.e., discharge power, CH 4 /CO 2 molar ratio, and gas flow rate) on CO 2 –CH 4 reforming were investigated. The highest conversion rate of CH 4 and CO 2 was found to be 40.57% and 27.15%, respectively, with CO and H 2 selectivity of 56.07% and 43.71%, respectively. The total energy efficiency achieved was 0.28 mmol/kJ. C 2 H 6 was found to be the main hydrocarbon product. Lastly, the mechanism of CO 2 –CH 4 reforming was proposed in terms of the active species and products.