Unique Role of Anchoring Penta-Coordinated Al3þ Sites in the Sintering of -Al2O3-Supported Pt Catalysts

Journal Article · Fri Jan 01 04:00:00 EST 2010 · The Journal of Physical Chemistry Letters

DOI:https://doi.org/10.1021/jz101073p· OSTI ID:1020201

Mei, D; Kwak, J; Hu, J; Cho, S; Szanyi, J; Allard, L; Peden, C

{gamma}-Al{sub 2}O{sub 3}-supported Pt group catalysts are widely used in many industrially important catalytic processes. However, {gamma}-Al{sub 2}O{sub 3}-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 Al{sup 3+} sites (Al{sub p}) on the {gamma}-Al{sub 2}O{sub 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.

• Research Organization: Brookhaven National Laboratory (BNL) National Synchrotron Light Source
• Sponsoring Organization: DOE - OFFICE OF SCIENCE
• DOE Contract Number: AC02-98CH10886
• OSTI ID: 1020201
• Report Number(s): BNL--96051-2011-JA
• Journal Information: The Journal of Physical Chemistry Letters, Journal Name: The Journal of Physical Chemistry Letters Journal Issue: 18 Vol. 1; ISSN 1948-7185
• Country of Publication: United States
• Language: English

Related Subjects

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
CATALYSTS
DEACTIVATION
FASTENING
FUNCTIONALS
HETEROGENEOUS CATALYSIS
MORPHOLOGY
OXIDES
PLATINUM
SINTERING
STRONG INTERACTIONS
national synchrotron light source