Coordinatively unsaturated Al3+ centers as binding sites for active catalyst phases on γ-Al2O3
A combination of ultrahigh resolution spectroscopy and microscopy techniques (ultrahigh magnetic field solid state magic angle spinning nuclear magnetic resonance (MAS-NMR) and high-resolution scanning transmission electron microscopy (HR-STEM)) coupled with first principles DFT calculations reveal the nature of anchoring sites of a catalytically active phase onto the surface of γ-Al2O3. The results obtained unambiguously prove that coordinatively unsaturated penta-coordinate Al3+ (Al3+penta) centers present on the (100) facets of the γ-Al2O3 surface are the sites where the anchoring of Pt occurs. At low loadings, the active catalytic phase is atomically dispersed on the support surface (Pt/ Al3+penta=1), while two dimensional Pt rafts form at higher coverages.
- Research Organization:
- Pacific Northwest National Lab. (PNNL), Richland, WA (United States). Environmental Molecular Sciences Lab. (EMSL)
- Sponsoring Organization:
- USDOE
- DOE Contract Number:
- AC05-76RL01830
- OSTI ID:
- 965555
- Report Number(s):
- PNNL-SA-67165; SCEHDK; 9103a; 19799; KC0302010; TRN: US200920%%336
- Journal Information:
- Science, 325(5948):1670-1673, Vol. 325, Issue 5948; ISSN 0193-4511
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
ORGANIC
PHYSICAL AND ANALYTICAL CHEMISTRY
CATALYST SUPPORTS
ALUMINIUM OXIDES
CATALYSTS
BINDING ENERGY
NUCLEAR MAGNETIC RESONANCE
TRANSMISSION ELECTRON MICROSCOPY
SCANNING ELECTRON MICROSCOPY
DENSITY FUNCTIONAL METHOD
SURFACE PROPERTIES
PLATINUM
Environmental Molecular Sciences Laboratory