Role of Oxygen Vacancies in Fe/Ru-Based Catalysts for the Reverse Water Gas Shift Reaction: Performance and Characterization

High Resolution Image Download MS PowerPoint Slide The Reverse Water–Gas Shift (RWGS) reaction is a key process for converting carbon dioxide (CO 2 ) into carbon monoxide (CO), enabling downstream synthesis of fuels and chemicals while contributing to CO 2 emissions mitigation. This study investigates the performance of several Fe x -Ru y -based catalysts supported on different doped oxide materials (La–Al 2 O 3, Ce–Al 2 O 3, Sm-CeO 2, Si–Al 2 O 3 ), with the goal of identifying a cost-effective and thermally stable alternative to purely noble metal systems. Catalysts were evaluated in atmospheric conditions up to 800 °C and subjected to repeated temperature ramp cycles to assess CO 2 conversion, CO selectivity, and long-term stability. Comprehensive characterization was performed using ICP-OES, BET, TPR, XRD, HRTEM, and XPS. The results reveal that optimizing the strength of the metal–support interaction, as well as the active metals ratio can have a significant impact, in terms of available active sites, which influences the catalytic performance, especially at lower temperatures (