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Issue 4, 2016
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Hydrothermal conversion of macroalgae-derived alginate to lactic acid catalyzed by metal oxides

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Abstract

Alginate derived from macroalgae was evaluated as a biomass feedstock for the production of lactic acid using metal oxides as solid base catalysts under hydrothermal conditions. The CaO catalyst exhibited the highest catalytic performance, yielding about 13% lactic acid at 200 °C for 1 h, while other metal oxide catalysts exhibited little activity. The hydration of CaO to Ca(OH)2 provides Brønsted bases (OH) in an aqueous medium. The lactic acid yields were proportional to the number of Brønsted bases. The CaO catalyst demonstrated nearly similar activity when it was used for the second time and the spent catalyst was successfully regenerated by calcination. The deactivation of the CaO catalyst during subsequent repeated uses arises from the loss of the available basic sites. Plausible reaction pathways for the catalytic conversion of alginate to lactic acid over CaO are also discussed.

Graphical abstract: Hydrothermal conversion of macroalgae-derived alginate to lactic acid catalyzed by metal oxides

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Publication details

The article was received on 27 Jun 2015, accepted on 15 Sep 2015 and first published on 16 Sep 2015


Article type: Paper
DOI: 10.1039/C5CY00966A
Catal. Sci. Technol., 2016,6, 1146-1156

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    Hydrothermal conversion of macroalgae-derived alginate to lactic acid catalyzed by metal oxides

    W. Jeon, C. Ban, G. Park, H. C. Woo and D. H. Kim, Catal. Sci. Technol., 2016, 6, 1146
    DOI: 10.1039/C5CY00966A

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