Journal
SCIENCE
Volume 325, Issue 5948, Pages 1670-1673Publisher
AMER ASSOC ADVANCEMENT SCIENCE
DOI: 10.1126/science.1176745
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Funding
- U. S. Department of Energy (DOE), Office of Science, Basic Energy Sciences, Division of Chemical Sciences
- Office of Energy Efficiency and Renewable Energy, Vehicle Technologies Program
- DOE [DE-AC05-76RL01830]
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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.
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