Modern Applications of Electron Microscopy to Catalysis |
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Authors: | Yacamán M. José Ascencio J.A. Tehuacanero S. Marín M. |
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Affiliation: | (1) Instituto de Física, Universidad Nacional Autónoma de México, Apartado Postal 20-364, 01000 México D.F., Mexico;(2) Instituto Nacional de Investigaciones Nucleares, Amsterdam 46-202, Col. Hippódromo Condesa, 06100 México D.F., Mexico |
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Abstract: | The active sites of ultra-dispersed Pt/ -Al2O3 catalysts are studied using high-resolution electron microscopy, Z-contrast and dark field. In addition we have calculated using a method based in density functional theory the electrostatic potential and charge distribution of the active sites. It is conclude that the most likely Pt clusters that are formed correspond to Pt13 and Pt with icosahedral and decahedral structure. It is shown that this is consistent with the electron microscopy data. |
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Keywords: | electron microscopy nanoparticles catalysis |
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