Efficient CH₃OH formation on H₂/Ar plasma‐treated CoO sites for CO₂ + H₂ + H₂O DBD system

Abstract

Packing heterogeneous catalysts to achieve a better plasma–catalyst synergy is critical to promoting CO2 conversion into high‐value chemicals. Herein, a series of CoO‐based catalysts were synthesized, and the treated H2/Ar–CoO possessed the highest CH3OH selectivity (39.6%) in the CO2 + H2 + H2O system, about four times higher than the initial CoO (10.0%). Systemic characterizations showed that H2/Ar plasma treatment significantly increased the oxygen vacancy (Ov) concentration of H2/Ar–CoO by Ar+ bombardment and synchronous H reduction. Considering the key role of CH3O on CH3OH generation upon kinetic simulations, we proposed that the Ov in H2/Ar–CoO could accelerate the CH3O/OH adsorption and further recombine with H/CH3, in which the H2O provided abundant OH/H radicals via electron‐impact process. This study highlighted the importance of using H2O with Ov‐rich catalysts for plasma‐enabled CH3OH synthesis.

Spark Discharge Plasma-Enabled CO2 Conversion Sustained by a Compact, Energy-Efficient, and Low-Cost Power Supply

“…Commonly used NTPs for CO 2 dissociation include dielectric barrier discharge (DBD), , spark discharge, , gliding arc discharge (GAD), , and microwave (MW) discharge. , DBD plasma is one of the most easily applicable plasma technologies for commercialization. − However, its low influx rate and energy loss through heat dissipation in dielectric materials limit the satisfying dissociation performance. GAD and MW plasmas with high power can achieve a high conversion rate while maintaining energy efficiency because of the absence of dielectric materials.…”