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ZIF-8 metal organic framework for the conversion of glucose to fructose and 5-hydroxymethyl furfural
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Oozeerally, Ryan, Ramkhelawan, Shivendra D. K., Burnett, David L., Tempelman, Christiaan H. L. and Degirmenci, Volkan (2019) ZIF-8 metal organic framework for the conversion of glucose to fructose and 5-hydroxymethyl furfural. Catalysts, 9 (10). 812. doi:10.3390/catal9100812 ISSN 2073-4344.
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Official URL: https://doi.org/10.3390/catal9100812
Abstract
Herein, Zeolitic imidazolate framework-8 (ZIF-8) is considered as an easy and cheap to prepare alternative catalyst for the isomerization of glucose and production of 5-hydroxymethyl furfural (HMF). For the synthesis of the ZIF-8 catalysts two preparation methods were evaluated, being room temperature and hydrothermal synthesis at 140 °C. Of these, the hydrothermal synthesis method yields a material with exceptionally high surface area (1967 m2·g−1). As a catalyst, the ZIF-8 materials generated excellent fructose yields. Specifically, ZIF-8 prepared by hydrothermal synthesis yielded a fructose selectivity of 65% with a glucose conversion of 24% at 100 °C in aqueous reaction medium. However, this selectivity dropped dramatically when the reactions were repeated at higher temperatures (~140 °C). Interestingly, greater quantities of mannose were produced at higher temperatures too. The lack of strong Brønsted acidity in both ZIF-8 materials resulted in poor HMF yields. In order to improve HMF yields, reactions were performed at a lower pH of 1.0. At 140 °C the lower pH was found to drive the reaction towards HMF and double its yield. Despite the excellent performance of ZIF-8 catalysts in batch reactions, their activity did not translate well to the flow reactor over a continuous run of 8 h, which was operating with a residence time of 6 min. The activity of ZIF-8 halved in the flow reactor at 100 °C in ~3 h, which implies that the catalyst’s stability was not maintained in the long run.
Item Type: | Journal Article | |||||||||
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Subjects: | Q Science > QD Chemistry T Technology > TP Chemical technology |
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Divisions: | Faculty of Science, Engineering and Medicine > Engineering > Engineering | |||||||||
Library of Congress Subject Headings (LCSH): | Metal-organic frameworks, Organometallic chemistry , Biomass , Catalysis , Glucose | |||||||||
Journal or Publication Title: | Catalysts | |||||||||
Publisher: | MDPI | |||||||||
ISSN: | 2073-4344 | |||||||||
Official Date: | 27 September 2019 | |||||||||
Dates: |
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Volume: | 9 | |||||||||
Number: | 10 | |||||||||
Article Number: | 812 | |||||||||
DOI: | 10.3390/catal9100812 | |||||||||
Status: | Peer Reviewed | |||||||||
Publication Status: | Published | |||||||||
Access rights to Published version: | Open Access (Creative Commons) | |||||||||
Date of first compliant deposit: | 27 September 2019 | |||||||||
Date of first compliant Open Access: | 27 September 2019 | |||||||||
RIOXX Funder/Project Grant: |
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