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Demonstrates the influence of CeO2 morphology on CO2 hydrogenation efficiency and selectivity.
The morphologies of CeO 2 nanocrystals significantly influence the Ru-catalyzed CO 2 hydrogenation. However, the morphology-dependent catalytic behaviors remain controversial and poorly understood. In this study, three shape-specific CeO 2 -supported Ru catalysts (cubes, polyhedra, and rods) were successfully synthesized, and then, the origin of morphology effects on Ru-catalyzed CO 2 hydrogenation was systematically investigated by means of ex situ/in situ characterizations. The cubic CeO 2 -supported Ru catalyst exhibited the highest CO 2 conversion rate and CH 4 selectivity. In situ DRIFTS revealed that CO 2 hydrogenation over Ru/CeO 2 proceeds via the formate and carbonyl routes, with the former being favored at lower temperatures. The detailed characterizations demonstrated that the morphology-dependent metal–support interaction (MSI) influences the chemical states of Ru species, thereby regulating the adsorption/activation of H 2 and the CO* intermediate, which ultimately determines the catalytic activity and selectivity in CO 2 hydrogenation. This study highlighted that the MSI strength, rather than oxygen vacancies, serves as a key descriptor governing the catalytic performance.
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Cao et al. (2026) studied this question.
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