| Synthesis of Au–Ag alloy nanoparticles supported on silica gel via galvanic replacement reaction |
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| 作者姓名： | Xiaoyan Liu Aiqin Wang Lin Li Tao Zhang Chung-Yuan Mou Jyh-Fu Lee |
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| 作者单位： | Dalian Institute of Chemical Physics,Chinese Academy of Sciences;Department of Chemistry,National Taiwan University;National Synchrotron Radiation Research Center |
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| 基金项目： | supported by grants from National Natural Science Foundation of China (NSFC No. 21176235);“Hundred Talents Program of Dalian Institute of Chemical Physics (DICP)” ;the National Science Council,Taiwan (NSC 98-2120-M-002-002);National Taiwan University for a postdoctoral fellowship(X. Liu) |
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| 摘 要： | Synthesis of supported Au-Ag bimetallic has attracted much attention since we found for the first time that Au and Ag had synergistic effect on CO oxidation and preferential CO oxidation in rich hydrogen.In this work,the formation of Au-Ag alloy nanoparticles supported on silica gel by galvanic replacement reaction has been investigated.We applied various characterizations including X-ray diffraction(XRD),transmission electronic microscopy(TEM),ultraviolet-visible spectroscopy(UV-vis),X-ray absorption spectroscopy(XAS) to characterize the formation process of Au-Ag alloy.Although the average particle sizes of the Au-Ag alloy nanoparticles obtained by the galvanic replacement reaction are relatively large comparing with that of loading Au first,the catalytic activity of the catalyst in preferential CO oxidation is almost the same.This result manifested that the particle size effect of Au-Ag nanoparticles was not as tremendous as that of monometallic gold.The formation of Au-Ag alloy made it less sensitive to the particle size.
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| 关 键 词： | Gold Silver Alloy XAS Galvanic replacement reaction |
| 收稿时间： | 2 September 2012 |
Synthesis of Au-Ag alloy nanoparticles supported on silica gel via galvanic replacement reaction |
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| Xiaoyan Liu,Aiqin Wang,Lin Li,Tao Zhang,Chung-Yuan Mou,Jyh-Fu Lee.Synthesis of Au-Ag alloy nanoparticles supported on silica gel via galvanic replacement reaction[J].Progress in Natural Science,2013,23(3):317-325. |
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| Authors: | Xiaoyan Liu Aiqin Wang Lin Li Tao Zhang Chung-Yuan Mou and Jyh-Fu Lee |
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| Institution: | 1. Dalian Institute of Chemical Physics, Chinese Academy of Sciences, 457 Zhongshan Road, Dalian 116023, China
2. Department of Chemistry, National Taiwan University, Taipei 10617, Taiwan;Dalian Institute of Chemical Physics, Chinese Academy of Sciences, 457 Zhongshan Road, Dalian 116023, China;Dalian Institute of Chemical Physics, Chinese Academy of Sciences, 457 Zhongshan Road, Dalian 116023, China;Dalian Institute of Chemical Physics, Chinese Academy of Sciences, 457 Zhongshan Road, Dalian 116023, China;Department of Chemistry, National Taiwan University, Taipei 10617, Taiwan;National Synchrotron Radiation Research Center, Hsinchu 30076, Taiwan |
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| Abstract: | Synthesis of supported Au–Ag bimetallic has attracted much attention since we found for the first time that Au and Ag had synergistic effect on CO oxidation and preferential CO oxidation in rich hydrogen. In this work, the formation of Au–Ag alloy nanoparticles supported on silica gel by galvanic replacement reaction has been investigated. We applied various characterizations including X-ray diffraction (XRD), transmission electronic microscopy (TEM), ultraviolet–visible spectroscopy (UV–vis), X-ray absorption spectroscopy (XAS) to characterize the formation process of Au–Ag alloy. Although the average particle sizes of the Au–Ag alloy nanoparticles obtained by the galvanic replacement reaction are relatively large comparing with that of loading Au first, the catalytic activity of the catalyst in preferential CO oxidation is almost the same. This result manifested that the particle size effect of Au–Ag nanoparticles was not as tremendous as that of monometallic gold. The formation of Au–Ag alloy made it less sensitive to the particle size. |
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| Keywords: | Gold Silver Alloy XAS Galvanic replacement reaction |
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