Comparison of glucose conversion to 5-HMF using different modified mordenites in ionic liquid and biphasic media

Modified mordenites have been used in the direct conversion of glucose into 5-hydroxymethylfurfural (5-HMF) in two different media: the ionic liquid 1-butyl-3-methylimidazolium bromide ([BMIM]Br) and a biphasic system composed of wateracetone and ethyl acetate. The results revealed that there are cr...

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Bibliographic Details
Published in:Catalysis science & technology 2016-01, Vol.6 (8), p.2766-2774
Main Authors: Mamo, W, Chebude, Y, Mrquez-lvarez, C, Daz, I, Sastre, E
Format: Article
Language:English
Subjects:
Catalysis
Catalytic activity
Conversion
Glucose
Ionic liquids
Lewis acid
Media
Zeolites
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Summary:Modified mordenites have been used in the direct conversion of glucose into 5-hydroxymethylfurfural (5-HMF) in two different media: the ionic liquid 1-butyl-3-methylimidazolium bromide ([BMIM]Br) and a biphasic system composed of wateracetone and ethyl acetate. The results revealed that there are crucial differences in the final catalytic performances. Modified mordenite treated with 1 M NH 4 Cl only, with a moderate Si/Al ratio of 11.2 and a high content of strong Brnsted acid sites (TPD NH 3 acidity of 1.39 mmol g 1 ), possessed the highest catalytic activity resulting in 64% 5-HMF yield with 97% glucose conversion in the ionic liquid system. On the other hand, the mordenite treated with 1 M NH 4 Cl and 2.4 M NH 4 F, with a total acidity of 1.51 mmol g 1 , mainly due to Lewis acid sites, gave 50% 5-HMF yield with 98% conversion in the biphasic system. The presence of strong Lewis acid sites has a major effect on the catalytic activity in aqueousorganic biphasic medium, in agreement with earlier works that showed that the reaction proceeds via Lewis acid-catalyzed isomerization followed by Brnsted acid-catalyzed dehydration. In contrast, the quick adsorption and strong interaction of the ionic liquid with the zeolite, which hinders the diffusion of the products, enhances the role of zeolite mesoporosity in the catalytic activity when the reaction is carried out in ionic liquid solution. Modified mordenites have been used in the direct conversion of glucose into 5-hydroxymethylfurfural (5-HMF) in two different media: the ionic liquid 1-butyl-3-methylimidazolium bromide ([BMIM]Br) and a biphasic system composed of wateracetone and ethyl acetate.
ISSN:2044-4753
2044-4761
DOI:10.1039/c5cy02070k