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Unraveling the mechanism of the oxidation of glycerol to dicarboxylic acids over a sonochemically synthesized copper oxide catalyst

Abstract

The utilization of low frequency ultrasound (US) offers a straightforward and powerful tool for the production of nanostructured materials, in particular structurally stable, highly crystalline, and shape-controlled catalytic materials. Herein, we report an unconventional strategy for the synthesis CuO nanoleaves within 5 min of US irradiation time. The as-obtained CuO nanoleaves were found selective in the base-free aqueous oxidation of glycerol to dicarboxylic acids (78% yield in tartronic and oxalic acids), in the presence of hydrogen peroxide (H2O2) and under mild reaction conditions. Density Functional Theory (DFT) investigations revealed a synergy between the CuO catalyst and H2O2 in maintaining the structural integrity of the catalyst during the reaction, creating alternative efficient pathways for the selective formation of dicarboxylic acids. Isotope labeling experiments using H218O2 further confirmed that oxygen from hydrogen peroxide, not from CuO, was preferentially incorporated into the dicarboxylic acid, significantly preserving the monoclinic structure of the CuO catalyst.

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Publication details

The article was received on 26 Mar 2018, accepted on 09 May 2018 and first published on 09 May 2018


Article type: Paper
DOI: 10.1039/C8GC00961A
Citation: Green Chem., 2018, Accepted Manuscript
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    Unraveling the mechanism of the oxidation of glycerol to dicarboxylic acids over a sonochemically synthesized copper oxide catalyst

    P. N. amaniampong, Q. T. Trinh, J. J. Varghese, R. Behling, S. Valange, S. H. Mushrif and F. Jerome, Green Chem., 2018, Accepted Manuscript , DOI: 10.1039/C8GC00961A

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