Issue 8, 2016

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

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

Article information

Article type
Paper
Submitted
30 nov 2015
Accepted
03 mar 2016
First published
04 mar 2016

Catal. Sci. Technol., 2016,6, 2766-2774

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

To request permission to reproduce material from this article, please go to the Copyright Clearance Center request page.

If you are an author contributing to an RSC publication, you do not need to request permission provided correct acknowledgement is given.

If you are the author of this article, you do not need to request permission to reproduce figures and diagrams provided correct acknowledgement is given. If you want to reproduce the whole article in a third-party publication (excluding your thesis/dissertation for which permission is not required) please go to the Copyright Clearance Center request page.

Read more about how to correctly acknowledge RSC content.

Social activity

Spotlight

Advertisements