Ni‐Based Catalysts Derived From Perovskite‐Like Oxides for CO ₂ Hydrogenation to C ₂ –C ₄ Hydrocarbons in a DBD Plasma Reactor

ABSTRACT The integration of catalysts with a dielectric barrier discharge (DBD) plasma reactor offers an efficient strategy for catalyzing CO 2 hydrogenation into C 2 –C 4 hydrocarbons under mild conditions. The reduced Ni‐based catalyst from perovskite has good metal dispersion, anti‐sintering ability, and low cost, demonstrating significant potential for industrial applications. To further increase the yield of the target product, it is necessary to optimize the structure of the catalyst and improve CO 2 hydrogenation performance. Since the Ni content in highly ordered perovskites is relatively low, it is more likely to form small Ni particles after reduction. Therefore, we focus on preparing the Ni catalyst from the perovskite‐like materials to increase Ni content and modify its morphology to improve the selectivity of C 2 –C 4 hydrocarbons in the CO 2 hydrogenation process. A series of perovskite‐like precursors with different La contents including LaNiO 3 , La 5 Ni 4 O 13 , La 3 Ni 2 O 7 , La 7 Ni 4 O 15 , and La 2 NiO 4 were synthesized. The Ni‐based catalysts derived from these precursors were investigated in a DBD plasma‐catalysis system for CO 2 hydrogenation to C 2 –C 4 . Among them, the Ni‐based catalyst from La 3 Ni 2 O 7 exhibited high reactivity at a discharge power of 55 W, achieving high CO 2 conversion of 69.2% and C 2 –C 4 selectivity of 8.5%. Characterization results including XRD, N 2 adsorption–desorption, TEM, and H 2 ‐TPR demonstrated that the superior CO 2 hydrogenation performance of La 3 Ni 2 O 7 is attributed to its enhanced surface area, high density of oxygen vacancies, abundant medium basic sites, and highly dispersed active metals. In addition, the catalyst exhibited exceptional thermal stability and sintering resistance, as evidenced by the fact that there was no significant difference in the structure and morphology of the catalyst after the reaction. This provides a promising pathway for converting carbon dioxide to value‐added chemicals.