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 shu

Thermally robust silica-enclosed Au₂₅ nanocluster and its catalysis

Haijun Chen ^a,c, ,
Chao Liu ^b ,
Min Wang ^a ,
Chaofeng Zhang ^a,c ,
Gao Li ^b ,
Feng Wang ^a

a State Key Laboratory of Catalysis, Dalian National Laboratory for Clean Energy, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, Liaoning, China;
b Gold Catalysis Research Centre, State Key Laboratory of Catalysis, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, Liaoning, China;
c Graduate University of Chinese Academy of Sciences, Beijing 100049, China

Received Date: 18 April 2016
Revised Date: 28 May 2016

Fund Project: This work was supported by the National Natural Science Foundation of China (21273231, 21422308), Dalian Excellent Youth Foundation (2014J11JH126) (FW), and the Starting Funds of "Thousand Youth Talents Plan" (GL).

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.
- Gold nanocluster,
- Au₂₅,
- Thermal stability,
- Silica,
- Hydrogenation
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Thermally robust silica-enclosed Au₂₅ nanocluster and its catalysis