Plasma-Assisted CO2 Hydrogenation to Light Hydrocarbons Over SiO2-Supported LaNi1-xCoxO3 Catalysts

Abstract

Plasma-assisted CO₂ hydrogenation offers a promising pathway for sustainable carbon utilization under mild conditions. In this study, a dielectric barrier discharge (DBD) plasma system was integrated with supported perovskite catalysts to convert CO₂. The effects of support type, B-site metal loading, and Co-doping ratio on the catalyst structure and reaction performance were investigated. Among the supports, the SiO₂-supported LaNi_1-xCo_xO₃ catalyst showed the best CO₂ hydrogenation performance due to its high specific surface area, abundant oxygen vacancies, and low dielectric constant. The loading of the B-site was tested, and the optimum loading of Ni and Co is 15 wt.%, which is attributed to its high specific surface area, good metal dispersion, and more medium basic sites. Varying the Co-doping ratio could modulate the catalyst's electronic structure and oxygen vacancy concentration, thereby influencing CO₂ hydrogenation activity and product selectivity. The suitable Co-doping ratio is 0.3 in terms of C₂–C₄ hydrocarbons selectivity and yield. These findings provide a new strategy for the utilization of CO₂ through low-temperature plasma catalysis.