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

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 promo...

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Bibliographic Details
Published in:New journal of chemistry 2020-03, Vol.44 (10), p.4171-4176
Main Authors: Maruani, Victor, Framery, Eric, Andrioletti, Bruno
Format: Article
Language:English
Subjects:
Ammonium acetate
Ammonium sulfate
Conversion
Decomposition
Glucose
Nitrogen atoms
Solid phases
Structural analysis
Sulfuric acid
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Summary: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.
ISSN:1144-0546
1369-9261
DOI:10.1039/D0NJ00155D