The structure of Pt particles on γ-Al2O3 support
- 1 August 1987
- journal article
- Published by International Union of Crystallography (IUCr) in Journal of Applied Crystallography
- Vol. 20 (4) , 300-305
- https://doi.org/10.1107/s0021889887086631
Abstract
Samples of the catalyst Pt/γ-Al2O3 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-Al2O3 has been established. In both calcined and reduced samples, the crystalline oxide α-PtO2 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.Keywords
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