Unique Role of Anchoring Penta-Coordinated Al3þ Sites in the Sintering of -Al2O3-Supported Pt Catalysts
{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 Lab. (BNL), Upton, NY (United States). National Synchrotron Light Source
- Sponsoring Organization:
- DOE - OFFICE OF SCIENCE
- DOE Contract Number:
- DE-AC02-98CH10886
- OSTI ID:
- 1020201
- Report Number(s):
- BNL-96051-2011-JA; TRN: US1103706
- Journal Information:
- The Journal of Physical Chemistry Letters, Vol. 1, Issue 18; ISSN 1948-7185
- Country of Publication:
- United States
- Language:
- English
Similar Records
Effects of Reduction Temperature and Metal-Support Interactions on the Catalytic Activity of Pt/g-Al2O3 and Pt/TiO2 for the Oxidation of CO in the Presence and Absence of H2.
Synthesis And Characterization of Gamma-Al2O3-Supported Pt Catalysts From Pt(4) And Pt(6) Clusters Formed in Aqueous Solutions