| Preparation, characterization, and catalysis of mecro-catalysts |
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| 作者姓名： | 肖丰收 B.C. Gates |
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| 作者单位： | State Key Laboratory for Catalysis，Dalian Institute of Chemical Physics，Chinese Academy of Sciences，Dalian 116023，China，Department of Chemistry，Jilin University，Changchun 130023，China，Department of Chemical Engineering and Materials Science，University of California，Davis，CA95616，USA |
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| 摘 要： | Because catalysis by metals is a surface phenomenon, many technological catalysts contain small (typically nanometre-sired) supported metal particles with a large fraction of the atoms exposed. Many reactions, such as hydrocarbon hydrogenations, are structure-insensitive, proceeding at approximately the same rates on metal particles of various sizes provided that they are larger than 1 nm and show bulk-like metallic behavior. But the catalytic properties are not known when metal particles become so small that their sizes are indium clusters consisting of several indium atoms. Here the catalytic behavior of precisely defined clusters of just four and six indium atoms on solid supports is shown. It is found that the Ir4 and Ir6 clusters differ in catalytic activity both from each other and from metallic Ir particles.
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Preparation, characterization, and catalysis of mecro-catalysts |
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| XIAO Fengshou.Preparation, characterization, and catalysis of mecro-catalysts[J].Science in China(Chemistry),1996(4). |
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| Authors: | XIAO Fengshou |
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| Abstract: | Because catalysis by metals is a surface phenomenon, many technological catalysts contain small (typically nanometre-sired) supported metal particles with a large fraction of the atoms exposed. Many reactions, such as hydrocarbon hydrogenations, are structure-insensitive, proceeding at approximately the same rates on metal particles of various sizes provided that they are larger than 1 nm and show bulk-like metallic behavior. But the catalytic properties are not known when metal particles become so small that their sizes are indium clusters consisting of several indium atoms. Here the catalytic behavior of precisely defined clusters of just four and six indium atoms on solid supports is shown. It is found that the Ir4 and Ir6 clusters differ in catalytic activity both from each other and from metallic Ir particles. |
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| Keywords: | metal clusters catalysis preparation characterization toluene hydrogenation EXAFS analysis chemisorption |
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