(560ay) LaxBa1-XFeO3 Perovskite Oxide for Low Temperature Thermochemical Conversion of Carbon Dioxide

Reverse water-gas shift chemical looping (RWGS-CL) is a thermochemical process to convert carbon dioxide to carbon monoxide by a lower temperature and high selectivity. The resulting carbon monoxide can be subsequently used for chemical energy storage in the form of hydrocarbon-based fuels and chemicals. Based on the catalyst requirements of RWGS-CL, this research focused on the synthesis and characterization of the La_xBa_1-xFeO₃ perovskite-type catalysts, which can form oxygen vacancies for CO₂ conversion. Temperature-programmed reduction (TPR), temperature-programmed oxidation (TPO) and long-term chemical looping experiments were performed to identify reaction temperatures, redox properties and CO yield. X-ray diffraction was utilized to identify the crystal structure. Comparing with other perovskite-type catalysts, La_xBa_1-xFeO₃ has the advantage of converting CO₂ to CO at a low temperature of 500 °C. La_0.25Ba_0.75FeO₃ shown a high CO yield of 1660 umol/g-catalyst and La_0.5Ba_0.5FeO₃ shown a high stability in the conversion process which is an important catalyst property using for industrial scale.