Mn-Promoted Ru-Based Catalysts for Enhanced Fischer–Tropsch Synthesis of Olefins from Syngas

The promotion effect of manganese on the Ru-based Fischer–Tropsch to olefins (FTO) reaction was investigated. Methane formation and second hydrogenation of olefins were effectively suppressed, while catalytic activity and olefin formation, especially for long-chain olefins, were greatly promoted with the addition of Mn. Structure characterization suggested that the addition of Mn could promote the dispersion of Ru nanoparticles (NPs) and enhance the electron density of metallic Ru sites, thus boosting the level of CO adsorption and dissociation. The electronic effect of Mn also creates a C*-rich local chemical environment that could weaken the hydrogenation of olefins. This work provides a simple and feasible way to improve Ru atom utilization for the rational design of Ru-based FTO catalysts.