Carbon dioxide involvement in the catalytic production of light olefins via Gd—Fe—Co perovskite-type complex oxides

The cohydrogenation of carbon oxides in the presence of complex oxides with the perovskite structure GdFe1−xCoxO3 (x = 0, 0.5, 1) was studied. The catalyst samples were synthesized via the sol—gel technology and characterized by XRD, XPS, FT-IR spectroscopy, N2 adsorption, TG, and DSC. The iron-containing samples demonstrated a high catalytic efficiency in the hydrogenation of simulated biosynthesis gas to light hydrocarbons. An increase in the carbon dioxide content in the reaction mixture to the ratio CO2/[CO + CO2] = 0.5 suppressed methane formation and favors the synthesis of light olefins. The hydrogenation of CO2 proceeds in two steps: the reverse water gas shift reaction to form CO followed by CO hydrogenation to yield olefins and paraffins. The tandem effect of Fe and Co enhances the selectivity for light olefins. These findings provide valuable information useful for the rational design of efficient bimetallic catalysts for biosyngas hydrogenation. © 2025 Elsevier B.V., All rights reserved.