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Issue 13, 2018
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CuO/CeO2 catalysts for glycerol selective conversion to lactic acid

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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.

Graphical abstract: CuO/CeO2 catalysts for glycerol selective conversion to lactic acid

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Publication details

The article was received on 17 Nov 2017, accepted on 10 Feb 2018 and first published on 16 Feb 2018

Article type: Paper
DOI: 10.1039/C7DT04340F
Citation: Dalton Trans., 2018,47, 4572-4582
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    CuO/CeO2 catalysts for glycerol selective conversion to lactic acid

    R. Palacio, S. Torres, S. Royer, A. S. Mamede, D. López and D. Hernández, Dalton Trans., 2018, 47, 4572
    DOI: 10.1039/C7DT04340F

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