EXAFS Model of 2-Dimensional Platinum Clusters

Highly dispersed supported platinum clusters have been extensively studied because of their many uses as the active metallic component in heterogeneous catalysts, including catalytic reforming. EXAFS modelling has been used to determine the average coordination number for the first through fifth Pt...

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Bibliographic Details
Published in:Journal of physics. Conference series 2013-01, Vol.430 (1), p.12061-4
Main Authors: Kelly, S D, Charochak, M E, Blackwell, N, Bare, S R
Format: Article
Language:English
Subjects:
Aluminum oxide
Catalysis
Catalysts
Clusters
Coordination numbers
Morphology
Physics
Planes
Platinum
Reforming
Transitional aluminas
Two dimensional models
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Summary:Highly dispersed supported platinum clusters have been extensively studied because of their many uses as the active metallic component in heterogeneous catalysts, including catalytic reforming. EXAFS modelling has been used to determine the average coordination number for the first through fifth Pt shells and thereby determine the average cluster size and shape. Several studies have shown that Pt clusters on γ-Al2O3 are truncated to form plate-like clusters in the hexagonal (111) plane as evidenced by an overly reduced second shell coordination number, which would be zero for a truly 2-dimensional cluster. In our system of Pt on γ-Al2O3 the average Pt morphology is determined, on the average, to be small ~13 atom clusters that are 2-diminsional in the hexagonal (111) plane morphology as determined by first and, nearly zero, second nearest neighbour coordination numbers of 4.4 ± 0.6 and 0.5 ± 0.3, respectively.
ISSN:1742-6588
1742-6596
DOI:10.1088/1742-6596/430/1/012061