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Production of High-Dispersed Palladium Particles on α-Al₂O₃ Nanoporous Microgranules by the Extractive-Pyrolytic Method



Author(s)

Vera Serga¹, Lidiya Kulikova¹, Aija Krumina¹, Svetlana Chornaja², Konstantin Dubencov² and Mikhail Maiorov³

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DOI:10.17265/2161-6213/2013.02.004

1. Institute of Inorganic Chemistry, Riga Technical University, Latvia
2. Faculty of Material Science and Applied Chemistry, Riga Technical University, Latvia
3. Institute of Physics, University of Latvia, Latvia

The extractive-pyrolytic method (EPM) was used for the production of composites based on nanocrystalline palladium. Nanoporous microgranules of α-Al₂O₃ prepared from a plasma-processed nanopowder of Al₂O_3, were used as a carrier. The organic precursor was prepared by extracting palladium from an aqueous solution using n-trioctylammonium chloride ((C₈H₁₇)₃NHCl) in toluene. The influence of pyrolysis conditions on the phase composition and nanoparticle size of final products has been investigated. X-ray diffraction measurements demonstrated that the heating of samples to 300, 350 and 400 °C (heating rate 14 °/min) resulted in the formation of nanocrystalline palladium on a porous carrier with an average particles size of 15, 23 and 28 nm, accordingly. IR spectra of the above-mentioned samples did not show the presence of organic impurities. Thermal treatment at 250 °C allows to obtain palladium particles with a crystal size of 7 nm, but the complete decomposition of the organic part has not been achieved under such conditions. It has been found that composites produced at pyrolysis temperatures of 250-400 °C (2.5 wt.% Pd content) exhibit catalytic activity at the oxidation of glycerin by molecular oxygen. The study of magnetic properties has shown that the composite produced at 300 ⁰C exhibits ferromagnetic properties.

Extractive pyrolytic method, palladium, α-Al₂O₃ nanoporous microgranules.