Environmental friendly palladium-halloysite-nanoparticle composites obtained by encapsulation of preformed palladium nanoparticles in raw halloysite nanotubes were used for palladium catalyzed organic reactions. A facile procedure was developed for synthesis of the Pd-halloysite nanocomposite and the material was characterized by XRD and TEM investigations. TEM studies reveal good levels of Pd nanoparticle inclusion within the tubular structure. The new Pd-halloysite material was employed in ligand free catalytic hydrogenation and Suzuki cross-coupling reactions. The Pdhalloysite nanocomposite displayed excellent activity as a hydrogenation catalyst allowing for the reduction of a variety of alkenes and alkynes at ambient temperature and pressures in a variety of solvent systems (EtOH, hexane) including water. The catalyst also showed good recyclability without any loss in activity. In addition, the synthesis of several biphenyl compounds was achieved using ligand-free SuzukiMiyaura cross-coupling reactions with aryl bromides and arylboronic acids in high yields. The synthesis and characterization of the Pd-halloysite nanocomposite as well as the scope and limitations of the catalytic activity of this new catalyst system will be presented.

Palladium nanoparticle-halloysite nanocomposites. Synthesis, characterization and catalytic activity

255th National Meeting (2018)

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