Citation:
Haijun Chen, Chao Liu, Min Wang, Chaofeng Zhang, Gao Li, Feng Wang. Thermally robust silica-enclosed Au25 nanocluster and its catalysis[J]. Chinese Journal of Catalysis,
;2016, 37(10): 1787-1793.
doi:
10.1016/S1872-2067(16)62478-6
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Well-defined gold nanoclusters with average size less than 2 nm have emerged as a new and novel catalyst. The gold nanocluster loaded on the oxide surface usually aggregates to larger particles at high temperature (>300℃), which is caused by the removal of the surface ligands. We herein present a novel method to prepare Au25 cluster catalyst (~1.3 nm) with high thermal stability (up to 400℃). Au25@SiO2 is synthesized via a co-hydrolyzing reaction of Au25[SC3H6Si(OCH3)3]18 and tetraethyl orthosilicate, and then it is treated at different temperature (e.g., 200, 300, 400℃) in air to remove the organic ligands. Au25@SiO2 is well characterized by transmission electron microscopy, ultraviolet-visible spectroscopy and diffuse reflectance UV-vis spectroscopy. Further, the Au25@SiO2 catalysts are investigated in the hydrogenation of p-nitrophenol into p-aminophenol.
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Keywords:
- Gold nanocluster,
- Au25,
- Thermal stability,
- Silica,
- Hydrogenation
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