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Influence of the ammonium salts used in the Brønsted acid catalyzed hydrothermal decomposition of d-glucose towards 5-HMF

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Abstract

In this work, we compare the effect of two ammonium salts (ammonium sulfate and ammonium acetate) used as promoters in the hydrothermal decomposition of D-glucose with the results obtained in the presence of sulfuric acid. For the first time, we demonstrate that ammonium acetate is not a good promoter due to the low conversion of D-glucose. Conversely, ammonium sulfate appears as a much more promising promoter. Indeed, even if a large amount of humins is observed, 5-HMF is obtained in good yield with a fast conversion of D-glucose. After isolation and characterization of the liquid and solid phases, the role of ammonium sulfate was thoroughly investigated. Structural characterization of the humins obtained from D-glucose and ammonium salts is also proposed. In addition, we demonstrated that with an ammonium-containing promoter, part of the nitrogen atoms is inserted in the humin structure as pyrrole derivatives.

Graphical abstract: Influence of the ammonium salts used in the Brønsted acid catalyzed hydrothermal decomposition of d-glucose towards 5-HMF

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Article information


Submitted
10 Jan 2020
Accepted
13 Feb 2020
First published
14 Feb 2020

New J. Chem., 2020, Advance Article
Article type
Paper

Influence of the ammonium salts used in the Brønsted acid catalyzed hydrothermal decomposition of D-glucose towards 5-HMF

V. Maruani, E. Framery and B. Andrioletti, New J. Chem., 2020, Advance Article , DOI: 10.1039/D0NJ00155D

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