Acid-Modified Clays for the Catalytic Obtention of 5-Hydroxymethylfurfural from Glucose

5-hydroxymethylfurfural (5-HMF) is an important platform molecule for the synthesis of high-added value products. Several synthesized clay materials, such as mesoporous hectorite and fluorohectorite, in addition to commercial montmorillonite K-10, have been acid modified by different methodologies t...

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Bibliographic Details
Published in:ChemEngineering 2022-08, Vol.6 (4), p.57
Main Authors: Sánchez, Vladimir, González, María Dolores, Salagre, Pilar, Cesteros, Yolanda
Format: Article
Language:English
Subjects:
5-hydroxymethylfurfural
acidity
Acids
Biodiesel fuels
Biofuels
Biomass
Brønsted
Carbon
Catalysts
Cellulose
Chemical engineering
Chemical synthesis
Clay
clays
Conversion
Glucose
Hydroxymethylfurfural
Lewis
Lewis acid
Lignocellulose
Mixtures
Montmorillonite
Rhenium
Rhenium compounds
Selectivity
Zeolites
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Summary:5-hydroxymethylfurfural (5-HMF) is an important platform molecule for the synthesis of high-added value products. Several synthesized clay materials, such as mesoporous hectorite and fluorohectorite, in addition to commercial montmorillonite K-10, have been acid modified by different methodologies to be applied as catalysts for the obtention of 5-HMF from glucose. The effects of the Brønsted and/or Lewis acidity, the reaction temperature and time, and the catalyst/glucose ratio on the conversion but especially on the selectivity to 5-HMF have been studied. By comparing the synthesized clays, the best selectivity to 5-HMF (36%) was obtained at 140 °C for 4 h with H-fluorohectorite because of the presence of strong Brønsted acid sites, although its conversion was the lowest (33%) due to its low amounts of Lewis acid sites. Different strategies, such as physical mixtures of montmorillonite K10, which contains high amounts of Lewis acid centers, with Amberlyst-15, which has high amounts of Brønsted acid sites, or the incorporation of rhenium compounds, were carried out. The best selectivity to 5-HMF (62%) was achieved with a mixture of 44 wt % Amberlyst-15 and 56 wt % of montmorillonite K10 for a 56% of conversion at 140 °C for 4 h. This proportion optimized the amount of Brønsted and Lewis acid sites in the catalyst under these reaction conditions.
ISSN:2305-7084
2305-7084
DOI:10.3390/chemengineering6040057