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The structure of Pt particles on γ‐Al 2 O 3 support
Author(s) -
Pan M.,
Cowley J. M.,
Chan I. Y.
Publication year - 1987
Publication title -
journal of applied crystallography
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.429
H-Index - 162
ISSN - 1600-5767
DOI - 10.1107/s0021889887086631
Subject(s) - high resolution transmission electron microscopy , transmission electron microscopy , materials science , oxide , scanning transmission electron microscopy , crystallography , scanning electron microscope , calcination , metal , analytical chemistry (journal) , nanotechnology , catalysis , chemistry , metallurgy , composite material , biochemistry , chromatography
Samples of the catalyst Pt/ γ ‐Al 2 O 3 have been examined by high‐resolution transmission electron microscopy (HRTEM), scanning transmission electron microscopy (STEM) and microdiffraction techniques. An epitaxic relationship of metallic Pt crystals on the γ ‐Al 2 O 3 has been established. In both calcined and reduced samples, the crystalline oxide α ‐PtO 2 was found along with metallic Pt. The oxide has a hexagonal lattice with unit‐cell dimensions about 6% smaller than those previously reported. Microdiffraction from areas less than 20 Å in diameter, combined with HRTEM, STEM and secondary electron microscopy (SEM), has proved to be a very powerful technique for the study of the structures of particles less than 50 Å in size.
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