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- Kwak, Ja Hun
- Molecular Catalysis Lab.
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Unique Role of Anchoring Penta-Coordinated Al3+ Sites in the Sintering of gamma-Al2O3-Supported Pt Catalysts
- Alternative Title
- Unique Role of Anchoring Penta-Coordinated Al3+ Sites in the Sintering of gamma-Al2O3-Supported Pt Catalysts
- Author(s)
- Mei, Donghai, Kwak, Jahun, Hu, Jianzhi, Cho, Sung June, Szanyi, Janos, Allard, Lawrence F., Peden, Charles H. F.
- Issued Date
- 2010-09
- Citation
- JOURNAL OF PHYSICAL CHEMISTRY LETTERS, v.1, no.18, pp.2688 - 2691
- Abstract
- 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
- Publisher
- AMER CHEMICAL SOC
- ISSN
- 1948-7185
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