Mono- and bi-metallic nanocatalysts in glycerol: from conception to applications in synthesis
Metal-based nanoparticles (MNPs) have been largely studied in the last decades due to their distinctive properties, which found applications in several fields (microelectronics, medicine, catalysis) [1]. “Nanocatalysis” emerged as a new concept that combines both colloidal catalysis and catalysis based on engineered nano-objects, showing defined structures and composition. Like most MNPs, aggregation during the catalytic reaction can lead to structure modifications, precluding their unique properties and then the lack of the expected reactivity. A way to avoid these drawbacks is to use solid supports in order to immobilise the nanocatalysts, favouring their recycling, but adding plausible effects due to the metal-support interactions. With the aim of preserving the surface state, the immobilisation of MNPs in a liquid phase has been considered. Besides environmentally friendly properties, glycerol is characterised by a complex supramolecular network, permitting to trap the catalyst and easily extract the organic products; the catalytic phase can be then recycled, obtaining metal-free target molecules [2]. Our team has proved the glycerol ability for the synthesis of both mono- (Pd, Cu and Cu2O, Ni) and bi-metallic nanoparticles, leading to stable colloidal catalytic solutions in the presence of polymers (such as PVP) [3], phosphines [4] and biomass-based stabilisers such as cinchona derivatives [5]. In particular, bimetallic nanoparticles have opened new horizons in energy conversions and organic transformations, thanks to cooperative effects between the two counterparts, due to structure-reactivity relationships (alloy, core-shell or hetero-dimer) [6]. In this lecture, we will present an account of our work in this field, from the synthesis and full characterisation of the metal-based nanoparticles in glycerol to the applications in synthesis.
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Event Timeslots (1)
Wednesday, March 7th
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Pr. Montserrat GOMEZ