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Communication dans un congrès
Pd–PPy nanocomposite on the surface of carbon nanotubes: synthesis and catalytic activity
Abstract : In the presence of carbon nanotubes (CNTs), palladium (Pd)-polypyrrole (PPy)@CNT nanocomposites have been synthesized by way of one-pot and one-step colloidal synthesis from a solution of a palladium inorganic salt and organic pyrrole as monomeric precursor to PPy. This efficient method leads to the growth of nanoparticles of the palladium inorganic component distributed inside a polymer matrix supported on CNTs. After characterization, palladium-PPy@CNT nanocomposites have been employed as efficient heterogeneous catalysts for direct C-H bond functionalization toward C-C bond coupling formation. The notable catalytic activity of the palladium-PPy@CNT nanocomposite decreased with successive catalytic cycles when using the same portion of the composite. This was attributed to palladium redistribution inside the PPy matrix, which occurs by way of a specific mechanism involving the reaction solvent and the composite during C-C coupling reaction. This mechanism is recrystallization of palladium nanoparticles in conductive PPy matrix. Nevertheless, the use of palladium-PPy@CNT nanocomposite in first cycle of investigated catalytic reaction facilitates C-C bond coupling formation: reaction occurs at lower temperature in comparison with homogeneous catalysts.
https://hal-univ-bourgogne.archives-ouvertes.fr/hal-01589821
Contributeur : Icmub - Université de Bourgogne Connectez-vous pour contacter le contributeur
Soumis le : mardi 19 septembre 2017 - 10:34:16
Dernière modification le : jeudi 22 juillet 2021 - 03:03:49
Contributeur : Icmub - Université de Bourgogne Connectez-vous pour contacter le contributeur
Soumis le : mardi 19 septembre 2017 - 10:34:16
Dernière modification le : jeudi 22 juillet 2021 - 03:03:49