One‐pot conversion of carbohydrates into γ‐valerolactone under the coordination of heteropoly acid based ionic liquid and Ru/ZrO2 in water media

BACKGROUND The chemical catalytic conversion of carbohydrates into γ‐valerolactone (GVL) is a sustainable alternative to the petrochemical process starting from the depleting fossil resources. Direct conversion of carbohydrates (fructose, glucose, starch and cellulose) into GVL was achieved via the...

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Published in:Journal of chemical technology and biotechnology (1986) 2019-07, Vol.94 (7), p.2355-2363
Main Authors: Ren, Hui‐Fang, Zhu, Dan, Li, Ji‐Fan, Liu, Chun‐Ling, Yang, Rong‐Zhen, Dong, Wen‐Sheng
Format: Article
Language:English
Subjects:
Acids
carbohydrate
Carbohydrates
Catalysis
Catalysts
Catalytic converters
Cellulose
Deactivation
Dehydration
Direct conversion
Fructose
functionalized ionic liquid
Glucose
Hail
Hydrogen storage
hydrogenation
Ionic liquids
Neutralization
Organic chemistry
Petrochemicals industry
Recyclability
Ruthenium
Starch
Zirconium dioxide
γ‐valerolactone
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Summary:BACKGROUND The chemical catalytic conversion of carbohydrates into γ‐valerolactone (GVL) is a sustainable alternative to the petrochemical process starting from the depleting fossil resources. Direct conversion of carbohydrates (fructose, glucose, starch and cellulose) into GVL was achieved via the combined heteropoly acid based SO3H‐functionalized ionic liquid (HAIL) and supported ruthenium (Ru) catalyst system in one pot and in water media. RESULTS A 63% GVL yield (based on fructose) was obtained under the catalysis of 1‐methyl‐3‐(3‐sulfopropylimidazolium)silicotungstate ([MIMPS]4SiW) and Ru/ZrO2 at 180 °C, first in 0.1 MPa nitrogen (N2) for 3 h (dehydration), and then in 4 MPa hydrogen (H2) for 10 h (hydrogenation). Under the same reaction conditions, the GVL yields from glucose, starch and cellulose were 68%, 60% and 60%, respectively. The recyclability of the catalytic system consisting of [MIMPS]4SiW and Ru/ZrO2 was investigated in four runs. The activity for [MIMPS]4SiW did not change after use. Partial deactivation of Ru/ZrO2 was observed, which was ascribed to the severe carbon deposition. CONCLUSIONS In the present method, HAIL and Ru/ZrO2 catalysts were loaded together. No separation and/or neutralization step reported in the literature was needed and only an atmosphere change (from N2 to H2) step was involved. Therefore, we provide a promising method for efficient conversion of carbohydrates into GVL. © 2019 Society of Chemical Industry
ISSN:0268-2575
1097-4660
DOI:10.1002/jctb.6031