Journal
CHEMICAL ENGINEERING JOURNAL
Volume 440, Issue -, Pages -Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.cej.2022.135844
Keywords
Hydrotalcite; Carbon nanotubes; Glucose isomerization; Fructose; Solid base catalysis; Green solvents
Categories
Funding
- National Natural Science Foundation of China [42171268, 21978170]
- National Key R&D Program of China [2018YFC0309800, 2017YFC0506004]
- Natural Science Foundation of Shanghai [19ZR1424800]
- Oceanic Interdisciplinary Program of Shanghai Jiao Tong University [SL2020MS022]
- Centre of Hydrogen Science, Shanghai Jiao Tong University, China
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In this study, an Mg-Al hydrotalcite/carbon nanotubes hybrid catalyst was prepared for efficient and selective glucose isomerization. The results showed that the tunable textural properties and basicity of the catalyst, achieved by tailoring the Mg/Al ratio and introducing CNT, improved the interaction between glucose and the catalyst, leading to enhanced catalytic performance.
Efficient and selective glucose-to-fructose isomerization is a crucial step in biorefinery, usually catalyzed by Lewis acid or BrOnsted base catalyst. However, inferior selectivity of Lewis acid and low conversion of BrOnsted base hamper the practical application. Herein, a Mg-Al hydrotalcite/carbon nanotubes hybrid catalyst was prepared using bottom-up strategy for glucose isomerization in water. Tunable textural properties and basicity of the catalyst was achieved by tailoring Mg/Al ratio while the introduction of CNT could further change the morphology and surface electronic properties, resulting in a desirable active site exposure and less particle aggregation. Additionally, DFT and in-situ FTIR experiment demonstrated glucose conversion proceed via base catalyzed route, and the increase of Mg/Al ratio as well as the electron deficiency of the surface would enhance the interaction between glucose and catalyst, which was conducive to the adsorption and deprotonation of glucose. As a result, a fructose yield of 40%, which is close to thermodynamic equilibrium yield, was obtained over HT5:1/CNT in water within 2 h.
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