Optimizing crystallinity of La2O2CO3 to boost reverse water-gas shift reaction performance over Co-based supported catalysts

Reverse water-gas shift (RWGS) reaction has become an important strategy to couple application of carbon resources and hydrogen energy. However, Co-based supported catalysts in RWGS reaction consistently experience deactivation under high-temperature operation, predominantly caused by carbon deposition and metal sintering, which present major barriers to the commercial deployment. Here, crystallinity for La 2 O 2 CO 3 supports were modulated to govern the metal-support interaction and CO 2 adsorption performance on Co-based supported catalysts, thereby optimizing RWGS reaction performance. Despite of poorly crystallized La 2 O 2 CO 3 -1 fostered a stronger interaction with Co species, which detrimentally compromised CO 2 adsorption capacity and inherent anti-coking functionality of La 2 O 2 CO 3 themselves. In contrast, employing well-crystallized La 2 O 2 CO 3 -2 as the support yielded the Co/La 2 O 2 CO 3 -2 catalyst, exhibiting superior CO 2 adsorption, exceptional resistance to carbon deposition, outstanding activity, high CO selectivity, and remarkable stability—maintaining consistent CO 2 conversion and selectivity for over 100 h at 600°C. This crystallinity-driven strategy effectively balances the Co-La 2 O 2 CO 3 interaction, presenting a novel way to boost RWGS reaction performance over Co-based supported catalysts.