Abstract
The ammonia-evaporation method is one of the most commonly methods for preparing Cu–SiO2 catalysts, and the improvement of this method is desirable. This work showed that it could improve the catalytic performance of the Cu–SiO2 catalyst in the hydrogenation of dimethyl oxalates (DMO) to ethylene glycol by introducing hydrothermal aging process and adjusting the aging time after evaporated ammonia. There was no obvious effect on copper phyllosilicate formation with the hydrothermal aging time increasing, but it affected the dispersion of Cu0 species among the copper phyllosilicate layers. As the number of Cu0 species is enough on the catalyst surface, the density of surface Cu0 species would affect the synergistic effect between Cu0 and Cu0 active sites. It is possible that the DMO absorbed on the Cu+ species would be inhibited while the density of surface Cu0 species is highly. Thus, the modified Cu–SiO2 catalyst by hydrothermal aging process with relatively low Cu0 dispersion exhibited enhanced catalytic performance in DMO catalytic hydrogenation.
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Acknowledgements
This work was supported financially by National Key R&D Program of China (2018YFA0704500), and the National Natural Science Foundation of China (No. 22102186).
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PZ: Conceptualization, Data curation, Investigation, Writing—original draft, Writing—review and editing. LH: Conceptualization, Methodology, Writing—review and editing. J-XY: Data curation, Methodology. RY: Writing—review and editing. M-LS: Writing—review and editing. FL: Writing—review and editing. Y-HW: Data curation. LL: Conceptualization, Resources, Supervision, Project administration, Writing—review and editing. Y-GY: Supervision, Writing—review and editing, Funding acquisition.
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Zhang, P., Huang, L., Yang, JX. et al. The Regulation of Surface Copper Species Coupled with Ammonia-Evaporation and Hydrothermal Aging Process to Enhance Catalytic Hydrogenation Properties of Cu–SiO2 Catalysts. Catal Lett 154, 1007–1017 (2024). https://doi.org/10.1007/s10562-023-04365-4
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DOI: https://doi.org/10.1007/s10562-023-04365-4