Synthesis and Thermal Stability of Palladium Nanoparticles Supported on γ−Αl2O3

(E-pub Ahead of Print)

Author(s): Ye.Yu. Kalishyn*, V.V. Ordynskyi, M.V. Ishchenko, I.B. Bychko, Z.V. Kaidanovych, A.I. Trypolskyi, P.E. Strizhak.

Journal Name: Current Nanomaterials

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Background: Deposition of the 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 nanosize effects and support influence on palladium catalytic properties.

Objective: The goal of the present work was a development of the preparation method of systems with the supported on γ-Al 2 O 3 palladium nanoparticles with a controlled size and determination of their thermal stability in the oxidizing and reducing atmospheres.

Method: We have demonstrated the preparation of Pd/γ-Al 2 O 3 composite by precipitation of the size- controlled palladium nanoparticles with the narrow size distribution from the colloidal solution. The composites were characterized by X-ray diffraction (XRD), transmission electron microscope (TEM) methods.

Result: The size and the size distribution of the nanoparticles supported on γ-Al 2 O 3 were found increasing upon precipitation due to the Pd/γ-Al 2 O 3 strong interaction. A significant enlargement of the supported nanoparticles occurs at 300 °C. The aggregation of the nanoparticles is observed at temperatures above 500 °C resulting in increasing their size.

Conclusion: Our findings are not only applicable for a preparation of the model Pd supported on the γ- Al 2 O 3 catalyst but could be applicable for designing the Pd-containing catalyst for important industrial high-temperature processes.

Keywords: Palladium, Nanoparticles, Contact angle, Sintering, Catalysis

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(E-pub Ahead of Print)
DOI: 10.2174/2405461505666191220114659