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

Research output: Contribution to journal › Article › peer-review

129 Scopus citations

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

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.",

author = "Donghai Mei and Kwak, \{Ja Hun\} and Jianzhi Hu and Cho, \{Sung June\} and J{\'a}nos Szanyi and Allard, \{Lawrence F.\} and Peden, \{Charles H.F.\}",

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doi = "10.1021/jz101073p",

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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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DO - 10.1021/jz101073p

M3 - Article

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SN - 1948-7185

VL - 1

SP - 2688

EP - 2691

JO - Journal of Physical Chemistry Letters

JF - Journal of Physical Chemistry Letters

IS - 18

ER -

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

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