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Probing Single Pt Atoms in Complex Intermetallic Al13Fe4

Author:
Yamada, Tsunetomo, Kojima, Takayuki, Abe, Eiji, Kameoka, Satoshi, Murakami, Yumi, Gille, Peter, Tsai, An Pang
Source:
Journal of the American Chemical Society 2018 v.140 no.11 pp. 3838-3841
ISSN:
1520-5126
Subject:
alloys, aluminum, hydrogenation, iron, platinum, transmission electron microscopy
Abstract:
The atomic structure of a 0.2 atom % Pt-doped complex metallic alloy, monoclinic Al₁₃Fe₄, was investigated using a single crystal prepared by the Czochralski method. High-angle annular dark-field scanning transmission electron microscopy showed that the Pt atoms were dispersed as single atoms and substituted at Fe sites in Al₁₃Fe₄. Single-crystal X-ray structural analysis revealed that the Pt atoms preferentially substitute at Fe(1). Unlike those that have been reported, Pt single atoms in the surface layers showed lower activity and selectivity than those of Al₂Pt and bulk Pt for propyne hydrogenation, indicating that the active state of a given single-atom Pt site is strongly dominated by the bonding to surrounding Al atoms.
Agid:
6033102