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Au nanoparticles controlled by lattice Zn2+ of supports

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Abstract

Supported Au nanoparticles (NPs) have attracted much attention in catalytic field because of their high activity and selectivity. However, its activity was affected by its dispersion. In this work, a controlled impregnation method was used to prepare Au/Zn-hydrotalcites (Au/Zn-HTs). The role of lattice Zn2+ in controlling Au NPs was studied. The size, structure, and composition of Au NPs were characterized using techniques of nitrogen physisorption, X-ray diffraction, scanning transmission electron microscopy, temperature-programmed reduction, and X-ray photoelectron spectroscopy. The mean size of Au/Zn-HTs by this work was 1.8 nm, which was smaller than the mean size of catalysts by traditional method. The mechanism of forming Au NPs was investigated. There was electron transfer between Au and Zn2+, displaying the interaction between them. It was found that dispersion of Zn2+ and the interaction between Au and Zn were two key factors affecting the dispersion of Au NPs. The dispersion of Zn2+ could be controlled by adjusting its content in HTs. The yield of acetophenone was 92% by Au/Zn-HTs, while it was below 65% for catalysts prepared by traditional method.

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Acknowledgments

This work was supported by projects funded by the Major Research Plan of National Natural Science Foundation of China (Program No. 91545130).

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Correspondence to Chunli Xu.

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Liu, D., Dong, W., Liu, C. et al. Au nanoparticles controlled by lattice Zn2+ of supports. Gold Bull 51, 85–97 (2018). https://doi.org/10.1007/s13404-018-0233-4

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  • DOI: https://doi.org/10.1007/s13404-018-0233-4

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