Tandem Pt/TiO and FeC catalysts for direct transformation of CO to light hydrocarbons under high space velocity.

CO hydrogenation to hydrocarbons under high space velocity is crucial for industrial applications, but traditional Fe-based catalysts often suffer from the low activity and poor stability. Herein, we report a new tandem catalyst system combining Pt/TiO catalysts with FeC catalysts for the direct conversion of CO into C-C hydrocarbons under high space velocity. The Pt/TiO component promotes *CO intermediate production with an enhanced Reverse Water-Gas Shift (RWGS) reaction efficiency, providing a highly reactive species for the FeC catalyst to achieve Fischer-Tropsch synthesis (FTS). By maximizing the contact interface between the Pt/TiO and Fe-based components through a granule mixing configuration, we achieve significant enhancements in both CO conversion rate (24.0 %) and C-C hydrocarbons selectivity (51.1 %) under the gaseous hourly space velocity (GHSV) of 100000 mL gh. Besides, excellent stability is achieved by the tandem catalysts with continuous catalysis for up to 80 h without significant decrease in activity. Through modulation of the reduction states of iron oxide, we effectively tune the composition of Fe-based catalyst, thereby tailoring the product distribution. Through this work, we not only offer a promising avenue for reducing CO for efficient CO utilization but also highlight the importance of catalyst design in advancing sustainable chemical synthesis.