Enhanced degradation efficiency of toluene using titania/silica photocatalysis as a regeneration process

Luo, Y., Zou, L. and Hu, Eric 2006, Enhanced degradation efficiency of toluene using titania/silica photocatalysis as a regeneration process, Environmental technology, vol. 27, no. 4, pp. 359-366.

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Title Enhanced degradation efficiency of toluene using titania/silica photocatalysis as a regeneration process
Author(s) Luo, Y.
Zou, L.
Hu, Eric
Journal name Environmental technology
Volume number 27
Issue number 4
Start page 359
End page 366
Publisher Taylor & Francis
Place of publication London, England
Publication date 2006-04
ISSN 0959-3330
1479-487X
Keyword(s) toluene
photocatalytic oxidation
nanoporous pellets
adsorption
regeneration
Summary Three kinds of titania/silica pellets were prepared using the sol-gel method with surface areas of 50.4m2 g-1, 421.1m2.g-1 and 89.1m2.g-1. An annular reactor was designed and built to determine the degradation efficiency of toluene and to investigate the relationship between the adsorption and desorption-photocatalytic processes. Surface area is an important factor influencing the adsorption-photocatalytic efficiency. Higher surface areas of pellets contribute to high rates of conversion of toluene. Un-reacted toluene and reaction intermediates accumulating on their surface deactivated the titania/silica catalyst. To overcome this problem, the adsorption and regeneration process were alternated in a dual reactor system. Connecting or disconnecting the toluene feed gas enabled one reactor to adsorb toluene, while the second reactor was regenerated by photocatalysis. Using UV irradiation and titania/silica pellets with high BET surface area (421.1 m2.g-1), the alternating adsorption/regeneration processes kept the degradation efficiency of toluene at 90% after 8 hours operation. By improving the adsorption-photocatalysis efficiency, and minimising the generation and accumulation of intermediate on the surface of pellets, the method extended catalyst life and maintained a high degradation efficiency of toluene.
Language eng
Field of Research 090703 Environmental Technologies
HERDC Research category C1 Refereed article in a scholarly journal
Copyright notice ©2006, Selper Ltd.
Persistent URL http://hdl.handle.net/10536/DRO/DU:30003618

Document type: Journal Article
Collection: School of Engineering and Information Technology
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