Comparison of the Catalytic Properties of25-Atom Gold Nanospheres and Nanorods

• 机 构: Department of Chemistry, Carnegie Mellon University, Pittsburgh, PA 15213, USA
• 出 处: 催化学报
• 发表日期: 2011年7期
• 关键词: nanoeluster catalyst icosabedral Au25 biieosahedral Au25 selective oxidation sel

The catalytic properties of two nanocluster catalysts with atomically precisely known structures,icosahedral two-shelled Au25(SC2H4Ph)18 nanospheres and biicosahedral Au25(PPh3)10(SCzH4Ph)5Cl2 nanorods,were compared.Their catalytic performance in the two reactions of the selective oxidation of styrene and chemoselective hydrogenation of α,β-unsaturated benzalacetone was investigated.The catalytic activities of icosahedral Au25(SC2H4Ph)18 nanospheres were superior to those of the bi-icosahedral Au25(PPh3)10(SC2H4 Ph)5Cl2nanorods for both reactions.The better catalytic performance of the Au25(SC2H4Ph)18 nanospheres can be attributed to their unique core-shell (Au13/Au12) geometric structure that has an open exterior atomic shell and to their electronic structure with an electron-rich AU13 core and an electron-deficient AU12 shell.