Platinum and Frustrated Lewis Pairs on Ceria as Dual‐Active Sites for Efficient Reverse Water‐Gas Shift Reaction at Low Temperatures

Abstract

The low-temperature reverse water-gas shift (RWGS) reaction faces the following obstacles: low activity and unsatisfactory selectivity. Herein, the dual-active sites of platinum (Pt) clusters and frustrated Lewis pair (FLP) on porous CeO₂ nanorods (Pt_cluster /PN-CeO₂ ) provide an interface-independent pathway to boost high performance RWGS reaction at low temperatures. Mechanistic investigations illustrate that Pt clusters can effectively activate and dissociate H₂ . The FLP sites, instead of the metal and support interfaces, not only enhance the strong adsorption and activation of CO₂ , but also significantly weaken CO adsorption on FLP to facilitate CO release and suppress the CH₄ formation. With the help of hydrogen spillover from Pt to PN-CeO₂ , the Pt_cluster /PN-CeO₂ catalysts achieved a CO yield of 29.6 %, which is very close to the thermodynamic equilibrium yield of CO (29.8 %) at 350 °C. Meanwhile, the Pt_cluster /PN-CeO₂ catalysts delivered a large turnover frequency of 8720 h^-1 . Moreover, Pt_cluster /PN-CeO₂ operated stably and continuously for at least 840 h. This finding provides a promising path toward optimizing the RWGS reaction.