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Gas-phase photocatalytic activity of nanostructured titanium dioxide from flame aerosol synthesis

Paper ID Volume ID Publish Year Pages File Format Full-Text
46443 46440 2012 9 PDF Available
Title
Gas-phase photocatalytic activity of nanostructured titanium dioxide from flame aerosol synthesis
Abstract

The experimental evaluation of gas-phase photocatalytic activity of a TiO2 nanopowder synthesized in a flame aerosol reactor was carried out in photocatalytic oxidation (PCO) of volatile organic compounds (VOCs). The nanopowder has an average particle size of 13 nm, anatase content 97 wt.% and the specific surface area of 102 m2 g−1. The performance was compared to the benchmark photocatalyst, the commercial pyrogenic titania P25, Evonik, with the average particle size of 21 nm. The full-factorial experiments were carried out varying contact times, concentrations of pollutants and temperatures in continuous gas-flow mode degrading aliphatic acrylonitrile (AN) and aromatic toluene. Higher conversions at more stable performance were observed for the flame aerosol synthesized photocatalyst in degradation of both pollutants. While the primary particle size and specific surface area present the apparent reasons for improved PCO performance in adsorbable AN, these parameters cannot do the same in oxidation of poorly adsorbable toluene: the superior generation of hydroxyl radicals and, therefore, advanced oxidative activity are proposed as explanation. The intense dehydration of reduced size anatase crystallites at elevated temperature (130 °C) presumably resulted in decreased OH-radicals production along with the improved desorption of HCN, the PCO by-product of AN. The safe performance is thus requiring lower operational temperatures. Slower deactivation and faster restoration of catalytic activity of flame aerosol synthesized catalyst under UV-A-radiation are discussed.

Graphical abstractFigure optionsDownload full-size imageDownload as PowerPoint slideHighlights► Superior photocatalytic performance of flame synthesized titania compared to P25. ► Anatase crystallites of reduced size were more sensitive to increased temperature. ► Slower deactivation and faster restoration of flame synthesized catalyst.

Keywords
Flame aerosol synthesis; Photocatalytic activity; Titanium dioxide; Air pollution; Volatile organic compounds
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis B: Environmental - Volumes 111–112, 12 January 2012, Pages 1–9
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