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

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

Content Provider	Royal Society of Chemistry (RSC)
Author	Mamo, W. Chebude, Y. Márquez-Álvarez, C. Sastre, E. Díaz, I.
Copyright Year	2016
Abstract	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 water–acetone and ethyl acetate. The results revealed that there are crucial differences in the final catalytic performances. Modified mordenite treated with 1 M NH4Cl only, with a moderate Si/Al ratio of 11.2 and a high content of strong Brønsted acid sites (TPDNH3 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 NH4Cl and 2.4 M NH4F, 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 aqueous–organic biphasic medium, in agreement with earlier works that showed that the reaction proceeds via Lewis acid-catalyzed isomerization followed by Brønsted 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.
Starting Page	2766
Ending Page	2774
Page Count	9
File Format	HTM / HTML PDF
ISSN	20444753
Volume Number	6
Issue Number	8
Journal	Catalysis Science & Technology
DOI	10.1039/c5cy02070k
Language	English
Publisher	Royal Society of Chemistry
Access Restriction	Open
Subject Keyword	Acid Isomerization Butyl group Ethyl acetate Strong interaction Glucose Zeolite Acids in wine Ionic liquid Bromide Ammonium chloride Ammonium fluoride Hydroxymethylfurfural Adsorption Lewis Mordenite Diffusion Dehydration reaction
Content Type	Text
Resource Type	Article
Subject	Catalysis

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