In situ Investigation of Phase Transitions in Fe Carbide based FT Catalysts

The development of sustainable carbon capture and utilization (CCU) strategies requires efficient pathways for CO₂ conversion. Fischer–Tropsch synthesis (FTS), which transforms syngas (CO/H₂) into hydrocarbons, remains central in this context. We develop Fe-based Fischer–Tropsch catalysts for efficient syngas valorization into added value products. A precisely reduced Fe₂O₃-derived carbide shows high activity and low CO₂ selectivity. Using Surface Organometallic Chemistry (SOMC), we introduce alkali dopants (Li, Na, K) while minimizing spectator species, enabling systematic study of promoter effects. Alkali-doped systems display strongly suppressed CO₂ formation and enhanced activity, chain growth, and olefin selectivity. To identify the structural origins of these trends, we propose ex situ and in situ TR-XRD to track phase evolution, purity, and dopant-induced changes. These insights will guide rational design of next-generation Fe-carbide FTS catalysts.