title: Quasi-homogeneous hydrogenation with platinum and palladium nanoparticles stabilized by dendritic core-multishell architectures.
abstract: Platinum and palladium nanoparticles, supported and stabilized by polymeric core-shell architectures, proved to be active catalysts for hydrogenation reactions. Here, two different reactions were used as probes to investigate the influence of the polymeric support: the hydrogenation of α-methyl styrene (AMS) to cumene and the partial hydrogenation of 1,5-cyclooctadiene (COD). We found that the stability of the nanoparticles and the rate of reaction are higher in the presence of a hydrophobic octadecyl shell within a three-shell polymer system. The kinetic study of AMS hydrogenation showed much higher activities for palladium nanoparticles than for platinum nanoparticles, and the obtained results (e.g., 35 kJ/mol for the activation energy) are of the same order of magnitude as reported earlier for palladium supported on alumina. A methanol/n-heptane biphasic mixture was tested for catalyst recycling and allowed for highly efficient catalyst separation with very low metal leaching.
authors.affiliation: Technische Universität Berlin, Institute of Chemistry, Strasse des 17.Juni 124, 10623 Berlin, Germany. ms@chem.tu-berlin.de
authors.forename: Michael
authors.initials: M
authors.lastname: Schwarze
authors.forename: Juliane
authors.initials: J
authors.lastname: Keilitz
authors.forename: Sabrina
authors.initials: S
authors.lastname: Nowag
authors.forename: Riny Y
authors.initials: RY
authors.lastname: Parapat
authors.forename: Rainer
authors.initials: R
authors.lastname: Haag
authors.forename: Reinhard
authors.initials: R
authors.lastname: Schomäcker