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Bimetallic Nanoparticles as Efficient Catalysts: Facile and Green Microwave Synthesis
Magda Blosi, 1 Simona Ortelli, 1 Anna Luisa Costa 1 , Michele Dondi, 1 Alice Lolli, 2 Sara Andreoli, 2 Patricia Benito, 2 Stefania Albonetti, 2 Nikolaos Dimitratos, Magda&nbspblosi, Simona&nbsportelli, Anna&nbspluisa&nbspcosta, Michele&nbspdondi, Alice&nbsplolli, Sara&nbspandreoli, Patricia&nbspbenito, Stefania&nbspalbonetti
1  ISTEC-CNR, Institute of Science and Technology for Ceramics, National Research Council, Via Granarolo 64, Faenza 48018, Italy;(M.B.);(S.O.);(A.L.C.);(M.D.)
2  Department Industrial Chemistry “Toso Montanari”, Bologna University, Viale Risorgimento 4, Bologna 40136, Italy;(A.L.);(S.A.);(P.B.)

Published: 08 July 2016 by MDPI in Materials
MDPI, Volume 9; 10.3390/ma9070550
Abstract: This work deals with the development of a green and versatile synthesis of stable mono- and bi-metallic colloids by means of microwave heating and exploiting ecofriendly reagents: water as the solvent, glucose as a mild and non-toxic reducer and polyvinylpirrolidone (PVP) as the chelating agent. Particle size-control, total reaction yield and long-term stability of colloids were achieved with this method of preparation. All of the materials were tested as effective catalysts in the reduction of p-nitrophenol in the presence of NaBH4 as the probe reaction. A synergistic positive effect of the bimetallic phase was assessed for Au/Cu and Pd/Au alloy nanoparticles, the latter showing the highest catalytic performance. Moreover, monoand bi-metallic colloids were used to prepare TiO2- and CeO2-supported catalysts for the liquid phase oxidation of 5-hydroxymethylfufural (HMF) to 2,5-furandicarboxylic acid (FDCA). The use of Au/Cu and Au/Pd bimetallic catalysts led to an increase in FDCA selectivity. Finally, preformed Pd/Cu nanoparticles were incorporated into the structure of MCM-41-silica. The resulting Pd/Cu MCM-41 catalysts were tested in the hydrodechlorination of CF3OCFClCF2Cl to CF3OCF=CF2. The effect of Cu on the hydrogenating properties of Pd was demonstrated.
Keywords: Au/cu, Pd/au, Pd/cu, Nanosols, microwave-assisted synthesis, supported catalysts, HMF, Hydrodechlorination
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