Jump to main content
Jump to site search

Issue 8, 2016
Previous Article Next Article

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

Author affiliations

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.

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

Back to tab navigation

Article information


Submitted
30 Nov 2015
Accepted
03 Mar 2016
First published
04 Mar 2016

Catal. Sci. Technol., 2016,6, 2766-2774
Article type
Paper

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

W. Mamo, Y. Chebude, C. Márquez-Álvarez, I. Díaz and E. Sastre, Catal. Sci. Technol., 2016, 6, 2766
DOI: 10.1039/C5CY02070K

Social activity

Search articles by author

Spotlight

Advertisements