Dramatic Effect of the Gelling Cation on the Catalytic Performances of Alginate-Supported Palladium Nanoparticles for the Suzuki-Miyaura Reaction - Archive ouverte HAL Accéder directement au contenu
Article Dans Une Revue Chemistry of Materials Année : 2012

Dramatic Effect of the Gelling Cation on the Catalytic Performances of Alginate-Supported Palladium Nanoparticles for the Suzuki-Miyaura Reaction

Résumé

This work describes the preparation and characterization of a library of alginate-supported palladium nanoparticles together with their catalytic capabilities to promote the Suzuki-Miyaura reaction. Using the chelating properties of the carboxylate functions of the alginate matrix a series of Ca, Ba, Mn, Zn, Ni, Ce, Cu, and Co alginate gels were first prepared and then reacted with Pd2+ salts. Partial exchange of metal cations followed by Pd reduction into palladium nanoparticles and supercritical CO2 drying generated a panel of bimetallic alginate aerogels. Physical characterizations of these materials showed a significant influence of both the gelling metal nature and the Pd loading on surface areas and nanoparticles size. A comparative study of the catalytic performances of these heterogeneous catalytic systems is then reported for the Suzuki-Miyaura reaction. This study highlighted the superior performances of palladium nanoparticles supported on copper-alginate aerogels. This heterogeneous catalyst showed high catalytic activities as illustrated by a TOF value of 10 s(-1) and a TON value close to 10(6). The robustness of the catalyst allowed several reuses with no significant loss of activity or metal leaching.
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Dates et versions

hal-00717944 , version 1 (14-07-2012)

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Mélanie Chtchigrovsky, Yi Lin, Kahina Ouchaou, Manon Chaumontet, Mike Robitzer, et al.. Dramatic Effect of the Gelling Cation on the Catalytic Performances of Alginate-Supported Palladium Nanoparticles for the Suzuki-Miyaura Reaction. Chemistry of Materials, 2012, 24 (8), pp.1505-1510. ⟨10.1021/cm3003595⟩. ⟨hal-00717944⟩
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