Title:Synthesis and Thermal Stability of Palladium Nanoparticles Supported on γ-Αl2O3
VOLUME: 5 ISSUE: 1
Author(s):Yevhen Y. Kalishyn*, Vladislav V. Ordynskyi, Mykola V. Ishchenko, Igor B. Bychko, Zinaida V. Kaidanovych, Andrii I. Trypolskyi and Peter E. Strizhak
Affiliation:L.V. Pisarzhevskii Institute of the Physical Chemistry of the National Academy of Sciences of Ukraine, 31, Nauky prospect, Kiyv 03028, L.V. Pisarzhevskii Institute of the Physical Chemistry of the National Academy of Sciences of Ukraine, 31, Nauky prospect, Kiyv 03028, Taras Shevchenko National University, 64/13, Volodymyrska Street, Kyiv 01601, L.V. Pisarzhevskii Institute of the Physical Chemistry of the National Academy of Sciences of Ukraine, 31, Nauky prospect, Kiyv 03028, L.V. Pisarzhevskii Institute of the Physical Chemistry of the National Academy of Sciences of Ukraine, 31, Nauky prospect, Kiyv 03028, L.V. Pisarzhevskii Institute of the Physical Chemistry of the National Academy of Sciences of Ukraine, 31, Nauky prospect, Kiyv 03028, L.V. Pisarzhevskii Institute of the Physical Chemistry of the National Academy of Sciences of Ukraine, 31, Nauky prospect, Kiyv 03028
Keywords:Palladium, nanoparticles, contact angle, sintering, catalysis, Pd/γ-Al2O3 composite.
Abstract:
Background: 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.
Objective: 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.
Methods: 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.
Results: 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.
Conclusions: 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.
