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Efficient base-free oxidation of monosaccharide into sugar acid under mild conditions using hierarchical porous carbon supported gold catalysts

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Abstract

Catalytic and selective oxidation of monosaccharides into value-added sugar acids is highly desirable from both scientific and industrial perspectives. Here, we report a hierarchical porous carbon (NC-3) supported gold catalyst (Au/NC-3) and its application in the base-free aerobic oxidation of D-glucose and D-xylose into value-added sugar acids under mild conditions (100 °C). The catalyst exhibited excellent catalytic performance with the yields of D-gluconic acid and D-xylonic acid reaching 97.62% and 98.76%, respectively. We studied the effect of the ball-milling process on the hierarchical porous preparation, which is critical to the formation of the fibrous structure during the pyrosis process. This specific structure provides active sites for Au adsorption. DFT calculation revealed that the Au NPs prefer to anchor on pyridinic N sites; meanwhile, the initial reactants and essential intermediates are found to be well stabilized by Au/NC-3. Moreover, upon recycling, gold was stable toward the recovery procedure. In this work, we provide a green method for an improved generally selective oxidation of D-glucose and D-xylose using Au/NC-3 as an efficient heterogeneous catalyst.

Graphical abstract: Efficient base-free oxidation of monosaccharide into sugar acid under mild conditions using hierarchical porous carbon supported gold catalysts

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Supplementary files

Article information


Submitted
19 Dec 2019
Accepted
25 Feb 2020
First published
29 Feb 2020

Green Chem., 2020, Advance Article
Article type
Paper

Efficient base-free oxidation of monosaccharide into sugar acid under mild conditions using hierarchical porous carbon supported gold catalysts

X. Meng, Z. Li, D. Li, Y. Huang, J. Ma, C. Liu and X. Peng, Green Chem., 2020, Advance Article , DOI: 10.1039/C9GC04333K

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