title: In Situ Generation of Pd-Pt Core-Shell Nanoparticles on Reduced Graphene Oxide (Pd@Pt/rGO) Using Microwaves: Applications in Dehalogenation Reactions and Reduction of Olefins.
abstract: Core-shell nanocatalysts are a distinctive class of nanomaterials with varied potential applications in view of their unique structure, composition-dependent physicochemical properties, and promising synergism among the individual components. A one-pot microwave (MW)-assisted approach is described to prepare the reduced graphene oxide (rGO)-supported Pd-Pt core-shell nanoparticles, (Pd@Pt/rGO); spherical core-shell nanomaterials (∼95 nm) with Pd core (∼80 nm) and 15 nm Pt shell were nicely distributed on the rGO matrix in view of the choice of reductant and reaction conditions. The well-characterized composite nanomaterials, endowed with synergism among its components and rGO support, served as catalysts in aromatic dehalogenation reactions and for the reduction of olefins with high yield (>98%), excellent selectivity (>98%) and recyclability (up to 5 times); both Pt/rGO and Pd/rGO and even their physical mixtures showed considerably lower conversions (20 and 57%) in dehalogenation of 3-bromoaniline. Similarly, in the reduction of styrene to ethylbenzene, Pd@Pt core-shell nanoparticles (without rGO support) possess considerably lower conversion (60%) compared to Pd@Pt/rGO. The mechanism of dehalogenation reactions with Pd@Pt/rGO catalyst is discussed with the explicit premise that rGO matrix facilitates the adsorption of the reducing agent, thus enhancing its local concentration and expediting the hydrazine decomposition rate. The versatility of the catalyst has been validated via diverse substrate scope for both reduction and dehalogenation reactions.
authors.affiliation: Regional Centre of Advanced Technologies and Materials, Department of Physical Chemistry, Faculty of Science, Palacky University , Šlechtitelů 27, 783 71 Olomouc, Czech Republic.
authors.forename: Anandarup
authors.initials: A
authors.lastname: Goswami
authors.affiliation: Regional Centre of Advanced Technologies and Materials, Department of Physical Chemistry, Faculty of Science, Palacky University , Šlechtitelů 27, 783 71 Olomouc, Czech Republic.
authors.forename: Anuj K
authors.initials: AK
authors.lastname: Rathi
authors.affiliation: Regional Centre of Advanced Technologies and Materials, Department of Physical Chemistry, Faculty of Science, Palacky University , Šlechtitelů 27, 783 71 Olomouc, Czech Republic.
authors.forename: Claudia
authors.initials: C
authors.lastname: Aparicio
authors.affiliation: Regional Centre of Advanced Technologies and Materials, Department of Physical Chemistry, Faculty of Science, Palacky University , Šlechtitelů 27, 783 71 Olomouc, Czech Republic.
authors.forename: Ondrej
authors.initials: O
authors.lastname: Tomanec
authors.affiliation: Regional Centre of Advanced Technologies and Materials, Department of Physical Chemistry, Faculty of Science, Palacky University , Šlechtitelů 27, 783 71 Olomouc, Czech Republic.
authors.forename: Martin
authors.initials: M
authors.lastname: Petr
authors.affiliation: Regional Centre of Advanced Technologies and Materials, Department of Physical Chemistry, Faculty of Science, Palacky University , Šlechtitelů 27, 783 71 Olomouc, Czech Republic.
authors.forename: Radka
authors.initials: R
authors.lastname: Pocklanova
authors.affiliation: Regional Centre of Advanced Technologies and Materials, Department of Physical Chemistry, Faculty of Science, Palacky University , Šlechtitelů 27, 783 71 Olomouc, Czech Republic.
authors.forename: Manoj B
authors.identifier: http://orcid.org/0000-0003-1575-094X
authors.initials: MB
authors.lastname: Gawande
authors.affiliation: Regional Centre of Advanced Technologies and Materials, Department of Physical Chemistry, Faculty of Science, Palacky University , Šlechtitelů 27, 783 71 Olomouc, Czech Republic.
authors.forename: Rajender S
authors.identifier: http://orcid.org/0000-0001-9731-6228
authors.initials: RS
authors.lastname: Varma
authors.affiliation: Regional Centre of Advanced Technologies and Materials, Department of Physical Chemistry, Faculty of Science, Palacky University , Šlechtitelů 27, 783 71 Olomouc, Czech Republic.
authors.forename: Radek
authors.identifier: http://orcid.org/0000-0002-3147-2196
authors.initials: R
authors.lastname: Zboril
keywords: Pd@Pt/rGO; core−shell nanocatalysts; dehalogenation; olefins; recyclable; reduction