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N- and/or W-(co)doped TiO2-anatase catalysts: Effect of the calcination treatment on photoactivity

Paper ID Volume ID Publish Year Pages File Format Full-Text
47478 46473 2010 7 PDF Available
Title
N- and/or W-(co)doped TiO2-anatase catalysts: Effect of the calcination treatment on photoactivity
Abstract

A series of nanosized W,N-codoped and single-doped N- and W-anatase-TiO2 catalysts have been prepared by a microemulsion method and calcined at different temperatures. The activity in the sunlight selective photo-oxidation of toluene and styrene has been correlated with structural, electronic, and surface examinations of the catalysts done with the help of XRD-Rietveld, N2 physisorption, X-ray photoelectron, infrared, electron paramagnetic resonance (EPR) and UV–vis spectroscopies. Irrespective of the reaction, W,N-codoped nanocatalysts showed an enhanced photoactivity with respect to bare anatase and single-doped N-TiO2 and W-TiO2 materials. A strong W–N synergistic interaction appears to play a decisive role in driving the excellent photoactivity performance of W,N-codoped materials by affecting (i) electronic properties, particularly maximizing the anatase band gap decrease and enhancing the subsequent visible light photon absorption, and (ii) surface properties, in turn related to the formation of OH radicals upon light excitation. The maximum photoactivity is reached by calcination at 450 °C and is concomitantly observed with a near complete selectivity to partial oxidation products. Higher calcination temperatures yielded solids with significantly inferior photocatalytic performance. The properties of the W–N interaction are discussed as a function of the calcination temperature.

Keywords
Photocatalysis; Titania; Doping; Nitrogen; Tungsten; Nanostructured mixed oxide; Visible and sunlight absorption; Selective partial oxidation; Toluene; Styrene
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N- and/or W-(co)doped TiO2-anatase catalysts: Effect of the calcination treatment on photoactivity
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis B: Environmental - Volume 95, Issues 3–4, 6 April 2010, Pages 238–244
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Catalysis
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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