Journal
CATALYSIS LETTERS
Volume 151, Issue 2, Pages 398-408Publisher
SPRINGER
DOI: 10.1007/s10562-020-03305-w
Keywords
Fructose dehydration; 5-HMF; Sulfonated carbon; Eucalyptus kraft lignin; Microwave heating
Categories
Funding
- FAPESP [2017/24931-4, 2016/05006-5]
- CAPES [001]
- CNPq [404843/2018-2]
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A highly acidic sulfonated carbon catalyst was obtained from eucalyptus kraft lignin and used for fructose dehydration, showing high activity and selectivity towards 5-HMF. The catalyst, produced at low cost, outperformed expensive commercial catalysts and could be recycled without significant loss in catalytic activity.
In this work, a highly acidic sulfonated carbon was obtained from eucalyptus kraft lignin, a byproduct from paper industry, and then used as catalyst in fructose dehydration. Reactions were performed employing dimethylsulfoxide (DMSO) as low cost/toxicity solvent and under microwave heating. The main product obtained was 5-hydroxymethylfurfural (5-HMF), a versatile platform compound that can be converted to several products of industrial interest. The catalyst is highly active to fructose dehydration and is able to convert 93.3% of the fructose (in a 10% m/v DMSO solution) with 98% of selectivity for 5-HMF in just 10 s at 393 K. Investigations about the catalyst dosage, reaction temperature and substrate concentration were carried out. In addition, the low-cost catalyst produced outperformed expensive commercial catalysts under the same conditions. After a simple regeneration process, the catalyst produced also can be recycled without significant loss in its catalytic activity. Graphic
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