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Thermally robust silica-enclosed Au_(25) nanocluster and its catalysis 被引量:4
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作者 陈海军 刘超 +3 位作者 王敏 张超锋 李杲 王峰 《Chinese Journal of Catalysis》 SCIE EI CAS CSCD 北大核心 2016年第10期1787-1793,共7页
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 (... 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 pre-sent a novel method to prepare Au25cluster catalyst (-1.3 nm) with high thermal stability (up to 400℃). Au25@Si02 is synthesized via a co-hydrolyzing reaction of Au2s[SC3H6Si(OCH3)3118 and tet-raethyl 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 Au2s@SiO2 catalysts are investigated in the hydrogenation ofp-nitrophenol into p-aminophenol. 展开更多
关键词 gold nanoclusterau2sthermal stabilitysilicahydrogenation
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