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【分享】9月25日的science：Al3+ as binding sites for Pt on Al2O3
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abstract： In many heterogeneous catalysts, the interaction of metal particles with their oxide support can alter the electronic properties of the metal and can play a critical role in determining particle morphology and maintaining dispersion. We used a combination of ultrahigh magnetic field, solid-state magic-angle spinning nuclear magnetic resonance spectroscopy, and high-angle annular dark-field scanning transmission electron microscopy coupled with density functional theory calculations to reveal the nature of anchoring sites of a catalytically active phase of platinum on the surface of a g-Al2O3 catalyst support material. The results obtained show that coordinatively unsaturated pentacoordinate Al3+ (Al3+ penta) centers present on the (100) facets of the g-Al2O3 surface are anchoring Pt. At low loadings, the active catalytic phase is atomically dispersed on the support surface (Pt/Al3+ penta = 1), whereas two-dimensional Pt rafts form at higher coverages. title：Coordinatively Unsaturated Al3+ Centers as Binding Sites for Active Catalyst Phases of Platinum on g-Al2O3 from ：25 SEPTEMBER 2009 VOL 325 SCIENCE link：http://www.sciencemag.org/cgi/content/abstract/325/5948/1670 [ Last edited by mingdong on 2009-12-9 at 08:21 ] |
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