Unique role of anchoring penta-coordinated Al3+ sites in the sintering of γ-Al2O3-supported Pt catalysts

Donghai Mei; Ja Hun Kwak; Jianzhi Hu; Sung June Cho; János Szanyi; Lawrence F. Allard; Charles H.F. Peden

doi:10.1021/jz101073p

Unique role of anchoring penta-coordinated Al³⁺ sites in the sintering of γ-Al₂O₃-supported Pt catalysts

Donghai Mei, Ja Hun Kwak, Jianzhi Hu, Sung June Cho, János Szanyi, Lawrence F. Allard, Charles H.F. Peden

Nuclear Energy Materials Microanalysis

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Abstract

γ-Al₂O₃-supported Pt group catalysts are widely used in many industrially important catalytic processes. However, γ-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 γ-Al₂O ₃(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.

Original language	English
Pages (from-to)	2688-2691
Number of pages	4
Journal	Journal of Physical Chemistry Letters
Volume	1
Issue number	18
DOIs	https://doi.org/10.1021/jz101073p
State	Published - Sep 16 2010

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abstract = "γ-Al2O3-supported Pt group catalysts are widely used in many industrially important catalytic processes. However, γ-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 (Alp) on the γ-Al2O 3(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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T1 - Unique role of anchoring penta-coordinated Al3+ sites in the sintering of γ-Al2O3-supported Pt catalysts

AU - Mei, Donghai

AU - Kwak, Ja Hun

AU - Hu, Jianzhi

AU - Cho, Sung June

AU - Szanyi, János

AU - Allard, Lawrence F.

AU - Peden, Charles H.F.

PY - 2010/9/16

Y1 - 2010/9/16

N2 - γ-Al2O3-supported Pt group catalysts are widely used in many industrially important catalytic processes. However, γ-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 (Alp) on the γ-Al2O 3(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.

AB - γ-Al2O3-supported Pt group catalysts are widely used in many industrially important catalytic processes. However, γ-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 (Alp) on the γ-Al2O 3(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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Unique role of anchoring penta-coordinated Al³⁺ sites in the sintering of γ-Al₂O₃-supported Pt catalysts

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