Enhanced degradation efficiency of toluene using titania/silica photocatalysis as a regeneration process
Data(s) |
01/04/2006
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Resumo |
Three kinds of titania/silica pellets were prepared using the sol-gel method with surface areas of 50.4m<sup>2</sup> g-1, 421.1m<sup>2</sup>.g<sup>-1</sup> and 89.1m<sup>2</sup>.g<sup>-1</sup>. 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 m<sup>2</sup>.g<sup>-1</sup>), 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. <br /> |
Identificador | |
Idioma(s) |
eng |
Publicador |
Taylor & Francis |
Relação |
http://dro.deakin.edu.au/eserv/DU:30003618/n20060407.pdf http://dx.doi.org/10.1080/09593332708618658 |
Direitos |
2006, Selper Ltd. |
Palavras-Chave | #toluene #photocatalytic oxidation #nanoporous pellets #adsorption #regeneration |
Tipo |
Journal Article |