Publications dans le JACS sur la valorisation du glycérol – Avril 2014

Self-Supported PdxBi Catalysts for the Electrooxidation of Glycerol in Alkaline Media

Anna Zalineeva doctorante russe de l’équipe E4 Catalyse et milieux non-conventionnels, Stève Baranton, et Christophe Coutanceau viennent de publier un article sur la valorisation du glycérol dans le JACS – Journal of the American Chemical Society : utilisation de nanostructures Palladium-Bismuth pour l’oxydation du glycérol. Produit notamment par l’industrie des bio-carburants, le glycérol est un déchet que l’on transforme en une molécule intéressante (un aldéhyde par exemple)… L’intérêt est la sélectivité de ces catalyseurs vers des produits de réactions hautement valorisables.

Anna Zalineeva

Anna Zalineeva IC2MP

Self-Supported PdxBi Catalysts for the Electrooxidation of Glycerol in Alkaline Media.

liste des auteurs : Anna Zalineeva, Alexey Serov, Monica Padilla, Ulises Martinez, Kateryna Artyushkova, Stève Baranton, Christophe Coutanceau, and Plamen B. Atanassov.

ABSTRACT : Highly active self-supported PdxBi catalysts are synthesized by the sacrificial support method. Self-supported PdxBi catalysts have a porous nanostructured morphology with high surface areas (in the range from 75 to 100 m2 g−1), making PdxBi a state-of-the-art catalyst.

Pd4Bi displays the highest activity toward glycerol oxidation. In situ Fourier transform infrared spectroscopy highlights the unique catalytic behavior of self-supported PdxBi materials due to their particular structure and morphology. The confinement of reactants and intermediates in pores acting as nanoreactors is responsible for the high selectivity as a function of the electrode potential : aldehyde and ketone at low potentials, hydroxypyruvate at moderate potentials, and CO2 at high potentials. Moreover, the selectivity depends on the electrode history : it is different for the positive potential scan direction than for the reverse direction, where the catalyst becomes selective toward the production of carboxylates.

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