Plasma‐Assisted CO ₂ Hydrogenation to Light Hydrocarbons Over SiO ₂ ‐Supported LaNi _1‐x Co _x O ₃ Catalysts

ABSTRACT Plasma‐assisted CO 2 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 CO 2 . 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 SiO 2 ‐supported LaNi 1‐x Co x O 3 catalyst showed the best CO 2 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 CO 2 hydrogenation activity and product selectivity. The suitable Co‐doping ratio is 0.3 in terms of C 2 –C 4 hydrocarbons selectivity and yield. These findings provide a new strategy for the utilization of CO 2 through low‐temperature plasma catalysis.