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| Azevedo, Nuno Monteiro |
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Strizhak, Peter
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article
Synthesis and Thermal Stability of Palladium Nanoparticles Supported on γ-Αl2O3
Abstract
<jats:sec> <jats:title>Background:</jats:title> <jats:p> Deposition of palladium nanoparticles from colloidal solution on various supports produces palladium catalysts with a predetermined size and concentration of the palladium nanoparticles, which allows to study the nanoparticle size effects and support influence on palladium catalytic properties.</jats:p> </jats:sec> <jats:sec> <jats:title>Objective:</jats:title> <jats:p>The goal of the present work was the development of a preparation method of systems supported on γ-Al2O3 palladium nanoparticles with a controlled size and determination of their thermal stability in oxidizing and reducing atmospheres.</jats:p> </jats:sec> <jats:sec> <jats:title>Methods:</jats:title> <jats:p>We demonstrated the preparation of Pd/γ-Al2O3 composite by precipitation of the size-controlled palladium nanoparticles with a narrow size distribution from colloidal solution. The composites were characterized by X-ray diffraction (XRD), and transmission electron microscope (TEM) methods.</jats:p> </jats:sec> <jats:sec> <jats:title>Result:</jats:title> <jats:p>The size and size distribution of the nanoparticles supported on γ-Al2O3 were found to be increasing upon precipitation due to strong Pd/γ-Al2O3 interaction. A significant enlargement of the supported nanoparticles occured at 300°C. The aggregation of the nanoparticles was observed at temperatures above 500°C resulting in an increase in their size.</jats:p> </jats:sec> <jats:sec> <jats:title>Conclusion:</jats:title> <jats:p>Our findings are not only applicable for the preparation of a model Pd supported on the γ-Al2O3 catalyst but could be applicable to the designing of the Pd-containing catalyst for important industrial high-temperature processes.</jats:p> </jats:sec>