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Catalytic hydrogenation of xylose to xylitol using ruthenium catalyst on NiO modified TiO2 support

Paper ID Volume ID Publish Year Pages File Format Full-Text
40932 45871 2012 7 PDF Available
Title
Catalytic hydrogenation of xylose to xylitol using ruthenium catalyst on NiO modified TiO2 support
Abstract

The activity of Ru catalyst on a new class of NiO modified TiO2 support, Ru/(NiO–TiO2), was studied in the liquid phase catalytic hydrogenation of xylose to xylitol. The TiO2 support was modified by simple impregnation method using nickel chloride precursor and subsequent oxidation. Various catalysts with different targeted compositions of Ru (1.0 and 5.0 wt%) and NiO (1.0, 5.0 and 10 wt%) in NiO–TiO2 were prepared. These catalysts were characterized by using energy dispersive X-ray analysis (EDX/EDS), temperature-programmed reduction (TPR), inductively coupled plasma (ICP) mass spectrometry, transmission electron microscopy (TEM), X-ray powder diffraction (XRD) and CO chemisorption. The novel catalysts are evaluated for selective hydrogenation of xylose and the results compared with those obtained from conventional Raney Ni, Ru/C and Ru/TiO2 catalysts carried out under identical reaction conditions. The effect of NiO additive in the catalyst Ru/(NiO–TiO2), clearly found to enhance the conversion, yield and selectivity to xylitol. Furthermore, the order of catalytic activity may be given as Ru (1.0%)/NiO (5.0%)–TiO2 > Ru (1.0%)/TiO2 > Ru (1.0%)/C> Raney Ni. The effects of Ru and NiO loading, xylose concentration (2.5, 15 and 30 wt%) and temperature (100, 120 and 140°C) were studied. Although at higher temp 140 °C, the conversion of xylose was increased to optimum level, xylose to xylitol selectivity decreased due to formation of by-products.

Graphical abstractFigure optionsDownload full-size imageDownload high-quality image (135 K)Download as PowerPoint slideHighlights► The modification of titania (TiO2) support with nickel chloride used as precursor. ► The catalyst of Ru on (NiO–TiO2) support is prepared by simple impregnation method. ► Liquid phase hydrogenation of xylose to xylitol over the catalyst Ru/(NiO–TiO2). ► A catalyst Ru/(NiO–TiO2) shows high conversion, yield and selectivity to xylitol. ► Comparative study towards xylose hydrogenation with Raney Ni, Ru/C and Ru/TiO2.

Keywords
Hydrogenation; Xylose; Xylitol; Ruthenium; NiO modified TiO2 support
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Catalytic hydrogenation of xylose to xylitol using ruthenium catalyst on NiO modified TiO2 support
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis A: General - Volumes 425–426, 28 May 2012, Pages 110–116
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