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Enhancing tungsten oxide/SBA-15 catalysts for hydrolysis of cellobiose through doping ZrO2

Paper ID Volume ID Publish Year Pages File Format Full-Text
38764 45790 2016 11 PDF Available
Title
Enhancing tungsten oxide/SBA-15 catalysts for hydrolysis of cellobiose through doping ZrO2
Abstract

•High surface area WZr/SBA-15 catalysts were prepared by hydrothermal method and characterized.•Doping proper amount of ZrO2 enhances acid density and surface area of WZr/SBA-15.•The activity of hydrolysis of cellobiose is significantly improved.•Enhanced accessible Brønsted acid site is essential for hydrolysis of cellobiose.

The number of strong acid sites on a hydrolysis catalyst accessible by the bulky cellulose limits its efficiency in the conversion and utilization of biomass-based resources. In this work, high surface area WZr/SBA-15 catalysts (>400 m2/g) were prepared by hydrothermal method and characterized using XRD, N2 adsorption, TEM, Raman, UV–vis, XPS and FTIR of pyridine adsorption. The results showed that doping a moderate amount of ZrO2 into the WO3/SBA-15 catalyst stabilized the tungstate species in the form of a polytungstate species as a result of the strong ZrOx-WOx interaction as well as increased the surface area of the catalyst. The resulting polytungstate species provided strong Brønsted acid sites for hydrolysis. Consequently, the cellobiose conversion was maximized at 5% ZrO2 loading, corresponding to a maximized surface area and density of Brønsted acid sites. This catalytic activity is significantly higher than that of a WO3/ZrO2 catalyst prepared using the conventional impregnation method, indicating the importance of mesoporous structure to the dispersion of active species and to the accessibility of the active sites by the bulky reactant. This result indicates that the density of the strong Brønsted acid sites with improved accessibility by the bulky reactant is essential to achieve a high hydrolysis activity.

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Keywords
Cellobiose; Hydrolysis; Glucose; WZr/SBA-15; Biomass conversion
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Enhancing tungsten oxide/SBA-15 catalysts for hydrolysis of cellobiose through doping ZrO2
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis A: General - Volume 523, 5 August 2016, Pages 182–192
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