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Effect of support on V2O5 catalytic activity in chlorobenzene oxidation

Paper ID Volume ID Publish Year Pages File Format Full-Text
40612 45860 2012 6 PDF Available
Title
Effect of support on V2O5 catalytic activity in chlorobenzene oxidation
Abstract

The present paper investigates the influence of the direct incorporation of ceria in TiO2 aerogels support (sulfated and unsulfated) prepared by a sol–gel route on the catalytic properties of vanadia based materials in the total oxidation of chlorobenzene. ICP-AES, N2 physisorption, XRD, DRIFTS, Raman spectroscopy, XPS, H2-TPR and NH3-TPD were employed for catalyst characterization. This study demonstrated that cerium oxide is present as CeO2 form at the catalyst surface, which can improve the catalyst redox properties and so enhance the catalytic activity at high temperature (400 °C). Besides, sulfate containing vanadia–titania samples (doped or not with ceria) had their catalytic performances considerably improved (due to sulfates) at lower temperatures (range 200–300 °C). This is due to an increased global acidity and higher reactivity of redox sites thanks to the superficial interaction between (i) vanadia and sulfate, and (ii) when ceria is present, between ceria and sulfate leading to higher efficiency of catalysts in the chlorobenzene oxidation.

Graphical abstractFigure optionsDownload full-size imageDownload high-quality image (151 K)Download as PowerPoint slideHighlights► TiO2, TiO2–SO42−, TiO2–CeO2 and TiO2–SO42−–CeO2 are prepared by sol gel route. ► Active vanadia is deposited on these aerogel supports by impregnation route. ► Vanadia based catalysts are tested in chlorobenzene oxidation. ► Cerium containing catalysts considerably improved catalytic properties at 400 °C. ► Sulfate containing samples improved catalytic properties in the range 200–300 °C.

Keywords
Aerogel; Sulfate; Cerium; Vanadia–titania; Chlorobenzene oxidation
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Effect of support on V2O5 catalytic activity in chlorobenzene oxidation
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis A: General - Volumes 447–448, 7 December 2012, Pages 1–6
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