Journal
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
Volume 1, Issue 18, Pages 2688-2691Publisher
AMER CHEMICAL SOC
DOI: 10.1021/jz101073p
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- U.S. Department of Energy, Office of Basic Energy Sciences
- Pacific Northwest National Laboratory
- Brookhaven National Laboratory [DE-AC02-98CH10886]
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gamma-Al2O3-supported Pt group catalysts are widely used in many industrially important catalytic processes. However, gamma-Al2O3-supported Pt catalysts are prone to deactivation via metal sintering at high temperatures, in oxidative reaction environments, or both. Using a combination of experimental HRTEM and EXAFS measurements and theoretical DFT calculations, we find that pentacoordinated Al3+ sites (Al-p) on the gamma-Al2O3(100) surface can inhibit Pt sintering both thermodynamically and kinetically because of their strong interactions with atomic Pt or Pt oxide species. The present work suggests a promising approach for stabilizing the size and morphology of supported catalytically active phases,
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