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Sustainable valorisation of glycerol via acetalization as well as carboxylation reactions over silicotungstates anchored to zeolite Hβ

Paper ID Volume ID Publish Year Pages File Format Full-Text
38873 45794 2016 10 PDF Available
Title
Sustainable valorisation of glycerol via acetalization as well as carboxylation reactions over silicotungstates anchored to zeolite Hβ
Abstract

•Valorization of glycerol over silicotungstates anchored to zeolite Hβ.•Effect of creating a lacuna on the parent silicotungstate has been discussed.•Highly efficient catalytic systems in terms of activity and selectivity.•Mild reaction conditions make the system environment friendly.•Catalysts can be recycled up to 4 times without significant loss in the activity.

A simple, green and effective pathway towards valorisation of glycerol to value added products has been demonstrated. In this context, catalysts comprising parent as well as lacunary silicotungstates anchored to large pore zeolite Hβ have been synthesized and characterized by various physicochemical methods. Parent silicotungstic acid based catalyst proved to be better catalyst in terms of conversion of glycerol showing 73% conversion for carboxylation reaction and 97% conversion of glycerol towards acetalization reaction. The better activity of the catalyst was correlated with its strong acidic character. It was observed that by tuning the acidity of parent silicotungstate by formation of lacunary silicotungstate leads to the increase in the selectivity of 5-membered dioxolane from 68% to 78% and selectivity of glycerol carbonate from 72% to 75%. Both the catalysts were reusable up to four cycles under the investigated reaction conditions. The probable mechanisms for both the reactions are also discussed.

Graphical abstractEnvironmentally benign route towards valorisation of glycerol via acetalization as well as carboxylation has been demonstrated over silicotungstates anchored to zeolite Hβ.Figure optionsDownload full-size imageDownload high-quality image (247 K)Download as PowerPoint slide

Keywords
Silicotungstates; Zeolite Hβ; Glycerol; Acetalization; Carboxylation; Heterogeneous catalysis
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Sustainable valorisation of glycerol via acetalization as well as carboxylation reactions over silicotungstates anchored to zeolite Hβ
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis A: General - Volume 515, 10 April 2016, Pages 154–163
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Catalysis
Get Full-Text Now
Don't Miss Today's Special Offer
Price was $35.95
You save - $31
Price after discount Only $4.95
100% Money Back Guarantee
Full-text PDF Download
Online Support
Any Questions? feel free to contact us