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Necessary conditions for a synergy between Ag and V2O5 in the total oxidation of chlorobenzene

Paper ID Volume ID Publish Year Pages File Format Full-Text
55738 47063 2011 6 PDF Available
Title
Necessary conditions for a synergy between Ag and V2O5 in the total oxidation of chlorobenzene
Abstract

V2O5/TiO2 catalysts are widely developed for the total oxidation of dioxins. However, this study presents an innovative way to improve the performances of V2O5/TiO2 catalysts by the addition of silver. Three kinds of catalysts were synthesized: Ag/TiO2, V2O5/TiO2 and Ag–V2O5/TiO2. The vanadia loading always corresponds to a 0.75 theoretical monolayer while 9 different loadings of silver were explored (0.02–12.5%). This new kind of catalysts is tested in the total oxidation of chlorobenzene which is a classical model molecule for dioxins. The samples were characterized by BET, XPS, XRD, ICP-AES and TEM before and after catalytic tests. The specific surface decreases with the increase of the silver loading for Ag/TiO2 and Ag–V2O5/TiO2 catalysts. XPS results show that the addition of silver to a V2O5/TiO2 formulation induces a higher oxidation state of the vanadium which should be beneficial on the performances. A synergy is indeed observed for several loadings of silver with a maximum at a loading of 0.05 wt.%. This synergistic effect between silver and vanadia can only be achieved in the total oxidation of chlorobenzene by choosing appropriate operating conditions, namely conditions avoiding AgCl formation. This synergy is directly linked to an optimal silver loading which offers the best compromise between a high oxidation state of vanadia without a significant decrease of the specific surface of the catalyst.

Graphical abstractFigure optionsDownload full-size imageDownload high-quality image (266 K)Download as PowerPoint slideHighlights► A synergy between Ag and V is highlighted in the total oxidation of chlorobenzene. ► A synergy can only be achieved with operating conditions which avoid AgCl formation. ► The specific surface decreases with the increase of the Ag loading. ► The oxidation state of the V increases with the increase of the Ag loading. ► The synergy is linked to a compromise between the oxidation state of the V and the specific surface.

Keywords
Silver; Vanadia; Chlorobenzene oxidation; Titania; Dioxin
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Necessary conditions for a synergy between Ag and V2O5 in the total oxidation of chlorobenzene
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Publisher
Database: Elsevier - ScienceDirect
Journal: Catalysis Today - Volume 175, Issue 1, 25 October 2011, Pages 177–182
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