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A new recyclable Pd catalyst supported on vertically aligned carbon nanotubes for microwaves-assisted Heck reactions
Authors:Izabela Janowska  Kambiz Chizari  Jean-Hubert Olivier  Raymond Ziessel  Marc Jacques Ledoux  Cuong Pham-Huu
Affiliation:1. Laboratoire des matériaux, surfaces et procédés pour la catalyse (LMSPC), UMR 7515 du CNRS, ECPM-université de Strasbourg, 25, rue Becquerel, 67087 Strasbourg cedex 02, France;2. Laboratoire de chimie organique et spectroscopies avancées (LCOSA), dans LMSPC UMR 7515 du CNRS, ECPM-université de Strasbourg, 25, rue Becquerel, 67087 Strasbourg cedex 02, France
Abstract:Palladium supported on vertically aligned multi-walled carbon nanotubes (Pd/VA-CNTs) is used as catalyst for the C-C coupling reactions of p-iodonitrobenzene with styrene and ethyl acrylate under microwaves irradiation. Pd/VA-CNTs catalyst exhibits higher activity compared to Pd supported on activated charcoal, under the same reaction conditions. Due to the microwaves irradiation, the kinetics of the reaction is strongly accelerated compared to that obtained with a traditional heating mode. The macroscopic form of aligned CNTs support allows an easy recovery of the catalyst, avoiding a costly post-reaction filtration. In addition, the interaction between the active phase and the support leads to the negligible leaching of palladium during recycling tests. The observed results indicate that Pd/CNTs is a recyclable and stable heterogeneous catalytic system.
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