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CuO/CeO2 catalysts for glycerol selective conversion to lactic acid

Abstract : Ceria supported copper oxide catalysts were produced by a deposition–precipitation method, at a high copper loading (up to >25 wt%). These materials demonstrated excellent properties for glycerol selective conversion to lactic acid, with a conversion reaching up to 87% with a selectivity to lactic acid of 74% (8 h reaction, 220 °C, under N2 pressure). These catalysts also exhibited high stability upon 5 successive reaction cycles. The formation of a crystalline CuO phase was demonstrated in the nanocomposites at a high Cu loading, with elongated shaped particles formed on the cerium oxide surface. Such particles were however, not observed at low Cu loadings. XPS analysis revealed that Cu(II) was the main Cu species on the fresh catalyst, and that this species was reduced to Cu(I) during the reaction. Complementary characterization over the spent catalyst clearly showed the morphological modifications of the CuO phase, however, did not impact significantly either glycerol conversion or selectivity to lactic acid upon recycling. For instance, apparently, the catalytic activity of CuO largely depends on the Cu(II) species.
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https://hal.univ-lille.fr/hal-03173365
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Soumis le : jeudi 18 mars 2021 - 14:12:28
Dernière modification le : mercredi 3 novembre 2021 - 09:58:57

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Ruben Palacio, Sebastian Torres, Sébastien Royer, Anne-Sophie Mamede, Diana López, et al.. CuO/CeO2 catalysts for glycerol selective conversion to lactic acid. Dalton Transactions, Royal Society of Chemistry, 2018, Dalton Transactions, 47 (13), pp.4572-4582. ⟨10.1039/C7DT04340F⟩. ⟨hal-03173365⟩

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