Redox behavior of novel FeOx/Pd/SiO2 catalytic nanomaterials
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Novel FeOx/Pd/SiO2 materials have been first synthesized by the redox methods including reduction with H2 at ambient conditions. The method of the temperature-programmed reduction with hydrogen (TPR-H2) was applied to study the influence of preparation conditions on the reducibility of supported FeOx species and stability of the reduced moieties to oxygen. The decreased temperature of β-PdH decomposition, as well as the intensive hydrogen consumption at − 50 to 100 °C due to FeOx reduction, has proved deposition of FeOx species on the surface of Pd nanoparticles. The phase composition, particle size and morphology were characterized with XRD, SEM and TEM. The highly reducible FeOx/Pd/SiO2 materials exhibited a multiple increase in the catalytic activity, as compared to the starting Pd/SiO2 material, in the selective hydrogenation of triple and double carbon bonds with molecular H2 in hydrogenation of phenylacetylene in liquid phase at room temperature and 1 bar hydrogen pressure.
KeywordsFe/Pd/SiO2 Nanoparticle preparation TPR-H2 Selective hydrogenation Phenylacetylene
Electron microscopy characterization was performed in the Department of Structural Studies of Zelinsky Institute of Organic Chemistry, Moscow. The authors thank Prof. I.V. Mishin for the XRD analysis. The work was carried out with a financial support from Russian Science Foundation, Grant No. 17-73-20282. This paper belongs to the ESTAC12 Conference.
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