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13 results on '"Wojcieszak, Robert"'

3. Effect of the Colloidal Preparation Method for Supported Preformed Colloidal Au Nanoparticles for the Liquid Phase Oxidation of 1,6-Hexanediol to Adipic Acid

Author

Monti, Eleonora, primary, Ventimiglia, Alessia, additional, Garcia Soto, Carolina Alejandra, additional, Martelli, Francesca, additional, Rodríguez-Aguado, Elena, additional, Cecilia, Juan Antonio, additional, Sadier, Achraf, additional, Ospitali, Francesca, additional, Tabanelli, Tommaso, additional, Albonetti, Stefania, additional, Cavani, Fabrizio, additional, Wojcieszak, Robert, additional, and Dimitratos, Nikolaos, additional

Published
2022
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5. Multicatalytic Hybrid Materials for Biocatalytic and Chemoenzymatic Cascades—Strategies for Multicatalyst (Enzyme) Co-Immobilization

Author

Júnior, Aldo Araújo da Trindade, primary, Ladeira, Yan Ferraz Ximenes, additional, França, Alexandre da Silva, additional, Souza, Rodrigo Octavio Mendonça Alves de, additional, Moraes, Adolfo Henrique, additional, Wojcieszak, Robert, additional, Itabaiana, Ivaldo, additional, and Miranda, Amanda Silva de, additional

Published
2021
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8. 5-Hydroxymethylfurfural and Furfural Base-Free Oxidation over AuPd Embedded Bimetallic Nanoparticles

Author

P. Ferraz, Camila, primary, Costa, Natalia J. S., additional, Teixeira-Neto, Erico, additional, Teixeira-Neto, Ângela A., additional, Liria, Cleber W., additional, Thuriot-Roukos, Joëlle, additional, Machini, M. Teresa, additional, Froidevaux, Rénato, additional, Dumeignil, Franck, additional, Rossi, Liane M., additional, and Wojcieszak, Robert, additional

Published
2020
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13. Effect of the Colloidal Preparation Method for Supported Preformed Colloidal Au Nanoparticles for the Liquid Phase Oxidation of 1,6-Hexanediol to Adipic Acid

Author

Eleonora Monti, Alessia Ventimiglia, Carolina Alejandra Garcia Soto, Francesca Martelli, Elena Rodríguez-Aguado, Juan Antonio Cecilia, Achraf Sadier, Francesca Ospitali, Tommaso Tabanelli, Stefania Albonetti, Fabrizio Cavani, Robert Wojcieszak, Nikolaos Dimitratos, Monti, Eleonora, Ventimiglia, Alessia, Soto, Carolina Alejandra Garcia, Martelli, Francesca, Rodríguez-Aguado, Elena, Cecilia, Juan Antonio, Sadier, Achraf, Ospitali, Francesca, Tabanelli, Tommaso, Albonetti, Stefania, Cavani, Fabrizio, Wojcieszak, Robert, Dimitratos, Nikolaos, Alma Mater Studiorum Università di Bologna [Bologna] (UNIBO), Universidad de Málaga [Málaga] = University of Málaga [Málaga], Unité de Catalyse et Chimie du Solide - UMR 8181 (UCCS), and Université d'Artois (UA)-Centrale Lille-Institut de Chimie du CNRS (INC)-Université de Lille-Centre National de la Recherche Scientifique (CNRS)

Subjects
supported Au colloidal nanoparticles, effect of stabilizer, production of adipic acid, [CHIM.ORGA]Chemical Sciences/Organic chemistry, supported Au colloidal nanoparticle, [CHIM.CATA]Chemical Sciences/Catalysis, Physical and Theoretical Chemistry, Catalysis
Abstract

International audience; Supported on activated carbon gold colloidal nanoparticles have been prepared in the presence of the stabilizing polymer PVA and PVP (polyvinylalcohol, polyvinylpyrrolidone). The effect of the polymer to the Au weight ratio was investigated, for synthesizing gold nanoparticles with different particle size and particle size distribution. By varying the polymer/Au wt/wt ratio, gold nanoparticles with mean diameters from 3 to 8 nm were synthesized. The synthesized Au catalysts were studied in the liquid phase oxidation of 1,6-hexanediol (HDO) to adipic acid under base and base-free conditions. A range of experimental parameters were varied for the optimization of reaction conditions and the most promising Au catalysts were further evaluated in terms of catalytic performance. We demonstrated that the influence of choice of polymer, tuning the polymer to Au weight ratio, HDO to Au molar ratio, and use of basic conditions have an important influence in terms of catalytic activity and selectivity to adipic acid. The highest yield to adipic acid was obtained using Au-PVA catalysts (40% at 110 °C under base free conditions), however, at low HDO to Au molar ratio and lower carbon balance (70–80%). On the contrary, at higher HDO to Au molar ratio, and under basic conditions, the yield was in the range of 18–20% with a significant improvement in terms of carbon balance (88–100%).

Published
2022

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