A Hybrid Plasma‐Catalysis System for CO2Hydrogenation over Perovskite‐Type Catalysts: Promoting Effect of A‐Site Substitution

A hybrid dielectric barrier discharge (DBD) plasma‐catalysis system is an effective way to catalyze the conversion of small molecules such as carbon dioxide. Until now, ABO 3 perovskite catalyst used for CO 2 hydrogenation to light hydrocarbons reaction has been rarely reported. Herein, the lanthanum nickel perovskite‐type catalysts named as La 0.8 A' 0.2 NiO 3± δ (A' represents for Ca, Ce, Pr, Sr) are prepared by a modified nitrate citric acid method, and the influence of A‐site substitution on catalytic performance is investigated. The reactivity results show that the substitution of A‐site can improve CO 2 conversion and C 2–4 (hydrocarbons containing C 2 –C 4 ) selectivity in varying degrees. Compared to LaNiO 3 catalyst, the La 0.8 Ca 0.2 NiO 3± δ catalyst has CO 2 conversion increased from 72.6% to 82.3%, and C 2–4 selectivity from 5.8% to 8.5%. The superior performance can be put down to the formation of smaller Ni particle size on La 0.8 Ca 0.2 NiO 3± δ catalyst, which promotes the activation of H 2 . Additionally, the sufficient oxygen vacancies on La 0.8 Ca 0.2 NiO 3± δ provide more active sites for CO 2 adsorption and then enhance CO 2 conversion. The hybrid DBD plasma‐catalysis system is proved effective for CO 2 hydrogenation, and the idea of using A‐site substitution would serve as a guide for the modification of perovskite‐type ABO 3 catalysts.