Constructing Co2C and ZSM-5 interface for enhanced activity in Fischer-Tropsch synthesis to olefins

Na- and Mn-promoted Co 2 C-based catalysts have demonstrated promise for the one-step conversion of syngas to olefins via Fischer-Tropsch synthesis to olefins (FTO). However, their consistently low activity limits their industrial applications. Here, we designed a compound catalyst comprising a CoMn composite catalyst and ZSM-5 zeolite, achieving 4.9 times the activity compared to the sole Co 2 C catalyst without compromising olefin selectivity. CO– and H 2 -TPD studies, in-situ DRIFT experiment, and DFT calculation revealed that the surface acidity of ZSM-5 modulated the strong electron effect of Na, subsequently strengthening H 2 adsorption on the Co 2 C catalyst surface. The H-assisted CO dissociation was therefore promoted and the catalyst activity was boosted. Meanwhile, Co 2 C as active site was unaffected, maintaining high selectivity to olefins. Constructing an interface between Co 2 C and ZSM-5 in the compound catalyst is proven to be a successful strategy for enhancing the activity of Co 2 C-based catalysts for FTO.