fulltext.study @t Gmail

Aqueous phase reforming of xylitol and sorbitol: Comparison and influence of substrate structure

Paper ID Volume ID Publish Year Pages File Format Full-Text
40831 45867 2012 9 PDF Available
Title
Aqueous phase reforming of xylitol and sorbitol: Comparison and influence of substrate structure
Abstract

The behavior of abundant polyol stemming from hemicelluloses, xylitol, was investigated in the aqueous phase reforming (APR) over supported Pt/Al2O3. The data obtained in the case of xylitol was compared to aqueous phase reforming of sorbitol under the same operating conditions. The effect of weight hour space velocity on the performance of a catalytic system as well as on selectivity toward hydrogen and alkanes was studied. The catalyst showed stable performance with insignificant deactivation over 160 h time-on-stream. The selectivity toward H2 diminished from 86 to 70% within 120 h. The regeneration of the catalytic system in a H2 flow allowed to recover the catalyst activity and to improve selectivity toward H2 to 75%. It was found that both polyols demonstrated similar behavior in the APR in the whole range of space velocities studied. The selectivity toward H2 went through a maximum in the case of xylitol and sorbitol when changing a space velocity. This behavior was attributed to a number of side reactions which involved hydrogen thus leading to its consumption. Additionally, the yields of target APR product, hydrogen, were higher in the case of xylitol compared to sorbitol due to the longer carbon chain in the latter substrate. The plausible reaction network based on the hypothesis that APR process proceeds through the terminal position of polyol was proposed to explain similarity in the gas and liquid product composition in the APR of xylitol and sorbitol. The reaction scheme describing formation of the main gas and liquid products via various pathways was proposed and discussed. The results obtained and explanations provided are in perfect agreement with the results obtained for other feedstocks in the literature.

Graphical abstractFigure optionsDownload full-size imageDownload high-quality image (93 K)Download as PowerPoint slideHighlights► Aqueous phase reforming of xylitol was studied over Pt/Al2O3 catalyst. ► Stable catalyst performance over 160 h time-on-stream. ► Higher selectivity to H2 compared to sorbitol. ► Advanced reaction network based on the substrate structure was proposed.

Keywords
Catalysis; Biomass conversion; Xylitol; Pt/Al2O3; Aqueous reforming; Hydrogen
First Page Preview
Aqueous phase reforming of xylitol and sorbitol: Comparison and influence of substrate structure
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
Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis A: General - Volumes 435–436, 5 September 2012, Pages 172–180
Authors
, , , , , ,
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