Abstract
The bimetallic x wt% Au–CuO/CeO2 catalysts with different Au contents (x = 0.5, 1, 2 wt%) and Au/CeO2, CuO/CeO2 samples are applied for CO2 hydrogenation to methanol. The catalysts are characterized by techniques such as XRD, Raman, XPS, H2-TPR and CO2-TPD measurements. It is shown that addition of 1 wt% of Au to CuO/CeO2 improves more significantly the catalyst activity in CO2 hydrogenation to methanol compared with other Au–CuO/CeO2 samples. The 1 wt% Au–CuO/CeO2 has a better ability to dissociatively adsorb hydrogen and enhance the number of oxygen vacancies, which leads to the highest methanol selectivity (T = 240 °C, P = 3 MPa, \(S_{{{\text{CH}}_{3} {\text{OH}}}}\) = 29.6%). The in situ DRIFTS reveals that a dual site character of the Au–CuO/CeO2 catalysts for CO2 hydrogenation, with CO2 being activated on sites of the CeO2 support, then stepwise hydrogenation of (bi)carbonate to formate and methoxy, finally methanol.
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Acknowledgements
This work was financially supported by the National Nature Science Foundation of China (21876019), Fundamental Research Funds for the Central Universities (DUT19LAB10), Dalian Science and Technology Innovation Fund (2019J12SN74) and the Fund of the State Key Laboratory of Catalysis in DICP (N-18-08).
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Weiwei Wang and Desiree Wager Kimpouni Tongo have contributed equally to this work.
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WW: Conceptualization, Methodology, Formal analysis, Data curation, Investigation, Writing-Original draft preparation. DWKT: Methodology, Formal analysis, Data curation, Investigation, Writing-Original draft preparation. LS: Visualization, Investigation, Software, Methodology. ZQ: Supervision, Funding acquisition, Project administration, Resources Validation, Conceptualization, Writing-Reviewing and Editing.
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Wang, W., Tongo, D.W.K., Song, L. et al. Effect of Au Addition on the Catalytic Performance of CuO/CeO2 Catalysts for CO2 Hydrogenation to Methanol. Top Catal 64, 446–455 (2021). https://doi.org/10.1007/s11244-021-01414-3
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DOI: https://doi.org/10.1007/s11244-021-01414-3