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Pd–PPy nanocomposite on the surface of carbon nanotubes: synthesis and catalytic activity

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Résumé

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.
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Dates et versions

hal-01589821 , version 1 (19-09-2017)

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Konstantin V Gor’kov, Nataliia V Talagaeva, Jean-Cyrille Hierso, Igor S Bezverkhyy, Polina A Pisareva, et al.. Pd–PPy nanocomposite on the surface of carbon nanotubes: synthesis and catalytic activity. 8th Seminar on Surface Phenomena and Nanosized Systems, Feb 2017, Moscou, Russia. pp.121 - 129, ⟨10.1680/jsuin.17.00016⟩. ⟨hal-01589821⟩
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