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SiO2 promoted Pt/WOx/ZrO2 catalysts for the selective hydrogenolysis of glycerol to 1,3-propanediol

Paper ID Volume ID Publish Year Pages File Format Full-Text
45894 46426 2014 9 PDF Available
Title
SiO2 promoted Pt/WOx/ZrO2 catalysts for the selective hydrogenolysis of glycerol to 1,3-propanediol
Abstract

•Addition of SiO2 to PtW/Zr greatly enhanced activity and 1,3-propanediol selectivity.•54.3% conversion and 52.0% 1,3-propanediol selectivity were achieved over 5PtW/ZrSi.•A model scheme of WOx transformation due to SiO2 doping has been built.•Pt and polytungstate have been identified as the dominant active phases.•Glycerol hydrogenolysis conforms to the dehydration–hydrogenation mechanism.

To improve 1,3-propanediol selectivity, a series of SiO2 modified Pt/WOx/ZrO2 catalysts with various SiO2 content for glycerol hydrogenolysis were prepared via deposition–precipitation method followed by sequential impregnation. These catalysts were systematically characterized using BET, ICP, CO chemisorption, XRD, H2-TPR, NH3-TPD, Raman, IR, TEM and XPS. The incorporation of suitable SiO2 into Pt/WOx/ZrO2 catalysts had extremely favorable effects on the dispersion of WOx and transformation from crystalline WO3 to active polytungstate, while superfluous SiO2 converted polytungstate to monotungstate. Among them, the 5PtW/ZrSi catalyst reached superior activity and maximum 1,3-propanediol selectivity, up to 52.0%. The structure-activity correlation indicated that glycerol hydrogenolysis conformed to dehydration–hydrogenation reaction mechanism and found that Pt and polytungstate were the most active species.

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Keywords
Glycerol; Hydrogenolysis; 1,3-Propanediol; Pt; WOx
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SiO2 promoted Pt/WOx/ZrO2 catalysts for the selective hydrogenolysis of glycerol to 1,3-propanediol
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis B: Environmental - Volumes 158–159, October 2014, Pages 391–399
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