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C2H2 oxidation by plasma/TiO2 combination: Influence of the porosity, and photocatalytic mechanisms under plasma exposure

Paper ID Volume ID Publish Year Pages File Format Full-Text
48244 46497 2008 10 PDF Available
Title
C2H2 oxidation by plasma/TiO2 combination: Influence of the porosity, and photocatalytic mechanisms under plasma exposure
Abstract

Plasma/catalyst combination is an active solution to reach high conversion rates at low energetic cost. TiO2 is one of the catalysts frequently used in dielectric barrier discharges. Plasma/TiO2 synergy was already exhibited but the mechanisms still have to be understood. This work distinguishes three main effects involved in the synergy: (a) effect of catalyst on the injected power, (b) the effect of porosity on C2H2 oxidation, and (c) the photocatalytic degradation of C2H2 on TiO2 under plasma exposure. Different glass fibres-based catalytic materials coated with SiO2 and/or TiO2 nano-particles are used to separate these three contributions regarding to C2H2 conversion. It is reported that at constant voltage the injected power is mainly increased by the presence of glass fibres. C2H2 oxidation is mainly enhanced by the macroporosity of glass fibres and in a minor way by the nano-particles. The production of O atoms close to the surface is probably responsible for the higher C2H2 removal efficiency with porous material. The photocatalytic activity of TiO2 is negligible in the plasma except if additional UV lamps are used to activate TiO2. With external UV, photocatalytic activity is more efficient in the plasma phase than in a neutral gas phase. This plasma/photocatalysis synergy is due to the use of O atoms in photocatalytic mechanisms.

Keywords
Plasma photocatalysis combination; Dielectric barrier discharge; TiO2; Porosity; O atoms; C2H2 oxidation; Air treatment
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C2H2 oxidation by plasma/TiO2 combination: Influence of the porosity, and photocatalytic mechanisms under plasma exposure
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis B: Environmental - Volume 80, Issues 3–4, 8 May 2008, Pages 296–305
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