Performance of LaFeO3 and La0.8Sr0.2FeO3 perovskites in Reverse Water-Gas Shift

Converting greenhouse gases to value added products is of high importance. CO2 conversion by Reverse Water-Gas Shift (RWGS) is a promising way to produce syngas as feedstock for eFuels. Perovskites are known for their oxygen exchange ability and can be utilized as RWGS catalysts. In this study, LaFeO3 (LF) and La0.8Sr0.2FeO3 (LSF) are examined as RWGS catalysts. LSF underwent Sr exsolution leading to evolution of cationic vacancies that strongly adsorb CO2. At sufficient H2 concentration (H2/CO2>4), the adsorbed CO2 is converted to CH4, thus reducing the CO selectivity and consuming additional H2. LF yielded stable CO2 conversion with no detected CH4 at all tested conditions (500°C-800°C, H2/CO2=0.3–8). Syngas with relevant ratios for eFuels synthesis (0.7