Enhancing the stability of Cu-based catalysts via La2O2CO3 crystallinity engineering in RWGS reaction

Crystallinity engineering of La 2 O 2 CO 3 boosts RWGS reaction performance. • Cu/La-24 achieves 58.3% CO 2 conversion with 99.9% CO selectivity at 600 °C. • Higher crystallinity strengthens Cu-support interaction and inhibits catalyst sintering. Reverse water-gas shift (RWGS) reaction offers a promising route for CO production and CO 2 utilization, but its industrialization has been hindered due to the lack of efficient catalysts. Among non-precious alternatives, Cu-based catalysts show high CO selectivity but suffer from poor thermal stability and rapid deactivation. Here, La 2 O 2 CO 3 support crystallinity engineering was adopted to enhance the performance over Cu-based catalysts. Cu/La-24 (high support crystallinity) and Cu/La-6 (low support crystallinity) catalysts were synthesized and evaluated. Compared with Cu/La-6 catalyst, Cu/La-24 catalyst exhibited a better CO 2 conversion (58.3% at 600 °C), while improving the reaction rate and catalytic stability. Characterization results revealed that higher crystallinity strengthened metal-support interaction, enhanced CO 2 adsorption capacity and inhibited catalysts sintering, collectively boosting catalytic performance. This work demonstrates that crystallinity regulation is an effective strategy for designing stable and active Cu-based catalysts, paving the way for designing more efficient catalysts for RWGS reaction. Download: Download high-res image (182KB) Download: Download full-size image