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Efficient green catalysis for the conversion of fructose to levulinic acid
[Display omitted] •Demonstration of fructose to levulinic acid with very high activity and selectivity using Dowex 50×8-100 resin.•We obtained an efficient system capable to produce the transformation under benign conditions.•This work provides more flexibility than dual catalyst systems reported pr...
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Published in: | Applied catalysis. A, General General, 2017-06, Vol.539, p.70-79 |
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Main Authors: | , , , , , |
Format: | Article |
Language: | English |
Subjects: | |
Citations: | Items that this one cites Items that cite this one |
Online Access: | Get full text |
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Summary: | [Display omitted]
•Demonstration of fructose to levulinic acid with very high activity and selectivity using Dowex 50×8-100 resin.•We obtained an efficient system capable to produce the transformation under benign conditions.•This work provides more flexibility than dual catalyst systems reported previously, behaving as a switchable catalyst for LA and HMF production depending on the nature of solvent.•Mechanistic insight provided on the formation of by-products leading to humins, the primary catalyst fouling mechanism for this reaction.
Highly efficient and selective production of levulinic acid has been achieved from D-fructose in the presence of polystyrene-based sulphonic acid resin catalyst, Dowex 50×8-100, at mild reaction conditions of 120°C, over 24h in a 50:50 mixture of water/GVL resulting in 72mol% yield under optimized reaction conditions. Optimization of the effect of reaction temperature, time, pressure, catalyst to substrate ratio, fructose concentration and solvent was performed. Various polystyrene-based sulfonic acid resins were also investigated for quantitative production of LA from 5-hydroxymethylfurfural (5-HMF) in pure water. Catalyst recycling was carried out up to 6 cycles. Significant mechanistic information was obtained for the formation of “humins”, which are the primary cause of catalyst fouling, by the identification of soluble by-products and polymerization presursors using Q-Tof mass spectrometry based on accurate masses. |
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ISSN: | 0926-860X 1873-3875 |
DOI: | 10.1016/j.apcata.2017.03.016 |