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Kwak, Ja Hun
Molecular Catalysis lab
Research Interests
  • Heterogeneous catalysis, molecular catalysis, ASlumima, zeolites

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Coordinatively Unsaturated Al3+ Centers as Binding Sites for Active Catalyst Phases of Platinum on gamma-Al2O3

Cited 146 times inthomson ciCited 148 times inthomson ci
Title
Coordinatively Unsaturated Al3+ Centers as Binding Sites for Active Catalyst Phases of Platinum on gamma-Al2O3
Other Titles
Coordinatively Unsaturated Al3+ Centers as Binding Sites for Active Catalyst Phases of Platinum on gamma-Al2O3
Author
Kwak, JahunHu, JianzhiMei, DonghaiYi, Cheol-WooKim, Do HeuiPeden, Charles H. F.Allard, Lawrence F.Szanyi, Janos
Keywords
GAMMA-ALUMINA SURFACES; SYSTEM; IONS; NMR; DFT
Issue Date
2009-09
Publisher
AMER ASSOC ADVANCEMENT SCIENCE
Citation
SCIENCE, v.325, no.5948, pp.1670 - 1673
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 gamma-Al2O3 catalyst support material. The results obtained show that coordinatively unsaturated pentacoordinate Al3+ (Al-penta(3+)) centers present on the (100) facets of the gamma-Al2O3 surface are anchoring Pt. At low loadings, the active catalytic phase is atomically dispersed on the support surface (Pt/Al-penta(3+) = 1), whereas two-dimensional Pt rafts form at higher coverages
URI
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DOI
10.1126/science.1176745
ISSN
0036-8075
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ECHE_Journal Papers
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