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V- or Mo-modified niobium catalysts for glycerin conversion reactions in the presence of H2O2

Paper ID Volume ID Publish Year Pages File Format Full-Text
40683 45862 2012 8 PDF Available
Title
V- or Mo-modified niobium catalysts for glycerin conversion reactions in the presence of H2O2
Abstract

In the present work, amorphous niobium oxides with 5% (w/w) vanadium or molybdenum isomorphically substituted into the material structure were synthesized. The materials were characterized by X-ray diffraction (XRD), Fourier-transform infrared spectroscopy (FTIR), scanning electron microscopy coupled with energy-dispersive X-ray spectroscopy (SEM/EDS), transmission electron microscopy (TEM), and X-ray photoelectron spectroscopy (XPS). The results show that vanadium and molybdenum were incorporated into the niobium oxide structure with concomitant changes in the morphologic and catalytic properties. Catalytic studies on the conversion of residual glycerin generated during biodiesel production in the presence of H2O2 showed enhanced efficiency of ether formation with the vanadium-containing material. The NbV/ethanol/glycerin/250 °C system was found to convert 80% of glycerin. Experiment-planning studies in conjunction with the analysis of the surface response via gas chromatography–mass spectrometry (GC–MS) aided in the determination of the optimal conditions. The catalytic tests monitored by GC–MS showed the formation a mixture of ethers obtained by the condensation of glycerol. Furthermore, it was observed that the modification of the catalyst directs the formation of larger molecules such as ketone mainly in the catalyst containing vanadium.

Graphical abstractFigure optionsDownload full-size imageDownload high-quality image (76 K)Download as PowerPoint slideHighlights► V-doped niobia highly active was obtained by the generation of peroxo groups after treatment with H2O2. ► The mass spectrometry showed that ether was mainly produced. ► The catalytic activity of modified niobia was monitored under several conditions.

Keywords
Doped niobia; Glycerol conversion; Heterogeneous catalysis; Oxidation process
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis A: General - Volumes 443–444, 7 November 2012, Pages 153–160
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
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Any Questions? feel free to contact us