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Effect of different reagents to adjust the pH on the synthesis, structure, and properties of Au/SiO2 catalysts obtained from aqueous HAuCl4

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Abstract

We compared the structures and properties of Au/SiO2 catalysts obtained from aqueous HAuCl4 using different reagents to adjust the pH value. The speciation of aqueous HAuCl4, Au colloids, and Au/SiO2 catalysts were characterized in detail by ultraviolet–visible (UV–Vis) absorption spectroscopy, ion chromatography, dynamic light scattering (DLS) measurements, X-ray diffraction (XRD) analysis, and X-ray photoelectron spectroscopy (XPS). The catalytic activity and stability of the Au/SiO2 catalysts in CO oxidation were also evaluated. The results show that the Au species in aqueous HAuCl4 and the morphology of Au colloids were apparently affected by the solution pH, but were independent of the reagent used to adjust the pH value. The catalytic activity of Au/SiO2 catalysts in low-temperature CO oxidation inevitably exhibited a volcano shape, depending on not only the pH value of the aqueous HAuCl4, but also the specific reagent used to adjust the pH value, while the stability of the Au/SiO2 catalysts depended only on the coexisting elements.

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Acknowledgements

This work was supported by the National Natural Science Foundation of China (21401065) and undergraduate Training Programs for Innovation, Entrepreneurship of Anhui Province (AH201310375051) and the Natural Science Foundation of Huangshan University (2011xkj014).

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Authors and Affiliations

  1. School of Chemistry and Chemical Engineering, Huangshan University, Huangshan, 245041, China

    Shu Wang, Jie Wang, Hongxia Fang, Yuchuan Zheng & Changjiang Li

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  1. Shu Wang
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  2. Jie Wang
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  3. Hongxia Fang
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Correspondence to Changjiang Li.

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Wang, S., Wang, J., Fang, H. et al. Effect of different reagents to adjust the pH on the synthesis, structure, and properties of Au/SiO2 catalysts obtained from aqueous HAuCl4 . Res Chem Intermed 43, 5625–5635 (2017). https://doi.org/10.1007/s11164-017-2952-1

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