Abstract
Low-temperature methanation allows the near-equilibrium conversion of CO2 to methane at atmospheric pressure, promising remarkable energy efficiency and economic interests. However, it remains challenging for the efficient catalytic activation of CO2 at low temperature owing to the kinetic limitations of hydrogenation intermediates. Here we report that Ni-based inverse catalysts composed of oxide nano-islands loaded on metallic Ni support show significant activity advantages over traditional Ni/oxide with the same composition. The optimized CeZrOx/Ni catalyst realizes ~90% CO2 conversion and >99% CH4 selectivity at 200 °C and atmospheric pressure; it also exhibits excellent long-term stability and overheating/start–stop cyclic operation stability. Mechanistic studies show that the inverse interface effectively modulates H2 and CO2 coverage and alters the configuration of adsorbed oxygenates, which benefits the hydrogenation of surface intermediates. Energy and economic analyses demonstrate that the low-temperature CO2 methanation process powered by inverse catalysts potentially reduces both capital investment and methane production costs.

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All data are available within the Article and its Supplementary Information. The atomic coordinates of the optimized computational models are provided in Supplementary Data 1. Source data are provided with this paper.
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Acknowledgements
This work is financially supported by the Zhejiang Provincial Natural Science Foundation of China (LR22B030003, L.L.; LQ24B030016, C.S.), Natural Science Foundation of China (22278367, L.L.), China Postdoctoral Science Foundation Grant (2022M712817, C.S.), Research Fund of Department of Education of Zhejiang Province (Y202249632, L.L.), National Natural Science Foundation of China 22232001 (D.M.), National Key R&D Program of China 2021YFA1501102 (D.M.), XPLORER Prize of Tencent Foundation (D.M.), New Cornerstone Science Foundation of Tencent Foundation (D.M.), Natural Science Foundation of China (22225206, X.W.), Natural Science Foundation of China (22202224, J.L.) and the Project of National Natural Science Foundation of China (U22A20415, Z.L.).
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L.L., D.M. and X.L. designed the study. C.S. and X.T. performed most of the reactions. X.T. and H. Lu carried out the stability experiments. J.L. and X.-D.W. performed the DFT calculations. R.W. and Z.L. performed the energy and economy analyses. K.W., Z.G. and F.Y. performed the TEM characterization. C.S. and H. Li carried out the DRIFTS analysis. C.S., L.L., S.Y. and M.P. wrote the paper. All authors discussed and revised the paper.
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Atomic coordinates of the optimized computational models
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Song, C., Liu, J., Wang, R. et al. Engineering MOx/Ni inverse catalysts for low-temperature CO2 activation with high methane yields. Nat Chem Eng 1, 638–649 (2024). https://doi.org/10.1038/s44286-024-00122-5
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DOI: https://doi.org/10.1038/s44286-024-00122-5