Study on the Catalytic Reduction Performance of Mg Doped BaSnO3 Perovskite for CO2 Conversion

Perovskite possess tunable crystal structures that enable the creation of active sites favorable for CO2 adsorption and activation through appropriate doping, while their electronic structures facilitate electron transfer during catalytic reactions. In this study, BaSnO3 was modified by substituting 4% of Ba with Mg to obtain Ba0.96Mg0.04SnO3 via a co-precipitation method. Structural and physicochemical characterization (ICP, XRD, SEM-EDS, BET) revealed that Mg doping reduced particle size, increased specific surface area by 26%, and enhanced oxygen storage capacity by 6.1%. The doped catalyst also exhibited improved thermal stability, with smaller losses in surface area and oxygen storage after 1200 °C thermal aging. CO2 adsorption tests showed higher adsorption rates and capacities, while catalytic reduction experiments demonstrated that Mg doping prolonged the catalyst’s lifetime from 24 to 40 cycles and increased maximum carbon deposition from 12.68% to 22.54%. These results indicate that Mg doping effectively enhances BaSnO3’s catalytic activity, structural stability, and durability, making Ba0.96Mg0.04SnO3 a promising candidate for CO2 thermal reduction applications.