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An investigation of trichloroethylene photocatalytic oxidation on mesoporous titania-silica aerogel catalysts

Paper ID Volume ID Publish Year Pages File Format Full-Text
48498 46510 2007 9 PDF Available
Title
An investigation of trichloroethylene photocatalytic oxidation on mesoporous titania-silica aerogel catalysts
Abstract

Freestanding blocks of mesoporous, titania-silica aerogel catalyst were prepared and tested for gas phase photocatalytic oxidation of trichloroethylene (TCE) in a new photoreactor where the reactant gases flow through the aerogel block. The intimate contact between the reactants and catalyst resulted in a higher conversion. TS01 aerogel was prepared by ethanol supercritical drying, and contained nanometer-sized crystalline domains of anatase TiO2 (i.e., TiOTi sites) within an amorphous SiOTi and SiOSi network. The TS02 aerogel prepared by CO2 supercritical drying remained amorphous even after high temperature treatment, and analysis indicated that the TiOSi is the predominant site on this catalyst. The reaction results indicated that only the TS01 aerogel containing anatase TiO2 was active, but the formation of dichloroacetaldehyde on the amorphous SiOSi sites led to a rapid catalyst deactivation. However, a stable catalyst was obtained after these sites were passivated by ozone pretreatment under ultraviolet (UV) irradiation. The TS01 aerogel catalysts exhibited an average conversion of 30% and a quantum yield of 0.27 at a TCE concentration of 56 ppm, feed flow rate of 40 sccm and UV irradiation of 710 μW cm−2.

Keywords
Nano-TiO2; Sol–gel; Gas transport; Photoreactor and in situ FTIR
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An investigation of trichloroethylene photocatalytic oxidation on mesoporous titania-silica aerogel catalysts
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis B: Environmental - Volume 76, Issues 1–2, 30 October 2007, Pages 64–72
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