K/LaFeMnO3 Perovskite-Type Oxide Catalyst for the Production of C2–C4 Olefins via CO Hydrogenation

LaBO 3 (B = Fe, Mn, and FeMn) perovskite-type oxides were prepared by sol–gel method and then used as catalysts in CO hydrogenation for light olefins. The catalysts were characterized using XRD, H 2 -TPR, SEM, CO (CO 2 )-TPD, and XPS. The results showed that the lattice oxygen migration and oxygen vacancies promoted oxygen mobility by doping Mn 2+ at the B site, Moreover, the presence of manganese as a promoter in the catalyst increased olefin selectivity compared with the olefin selectivity of the catalyst containing iron at the B-site and exhibited resistance to carbon deposition; while reducing the metal elements. In CO hydrogenation, potassium-promoted LaFeMnO 3 catalysts afforded high catalytic activity and C 2 = –C 4 = selectivity. An O/P value of 5.0 and a C 2 = –C 4 = fraction of 54% were achieved for all hydrocarbons with low methane selectivity. Graphic Abstract