Performance comparison of CO sub(2) conversion in slurry and monolith photoreactors using Pd and Rh-TiO sub(2) catalyst under ultraviolet irradiation

Anthropogenic activities are causing an increase in greenhouse gases in the atmosphere, with carbon dioxide (CO sub(2)) being the key cause of global warming. The conversion of CO sub(2) into valuable hydrocarbons serves as a promising route for mitigating the effects of global warming and meeting f...

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Bibliographic Details
Published in:Applied catalysis. B, Environmental Environmental, 2012-09, Vol.126, p.172-179
Main Authors: Ola, Oluwafunmilola, Maroto-Valer, Mercedes, Liu, Dong, Mackintosh, Sarah, Lee, Chien-Wei, Wu, Jeffrey C S
Format: Article
Language:English
Subjects:
Annular
Catalysts
Global warming
Palladium
Reactors
Reduction
Slurries
Titanium dioxide
Online Access:Get full text
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Summary:Anthropogenic activities are causing an increase in greenhouse gases in the atmosphere, with carbon dioxide (CO sub(2)) being the key cause of global warming. The conversion of CO sub(2) into valuable hydrocarbons serves as a promising route for mitigating the effects of global warming and meeting future energy demands. Herein, we show the comparison between the photocatalytic reduction of CO sub(2) for metal coated TiO sub(2) nanoparticles in a slurry batch annular reactor system and metal coated TiO sub(2) monoliths in an internally illuminated photoreactor system using the 1 wn% Pd/0.01 wt% Rh-TiO sub(2) catalyst. Carbon based fuels, such as methane, methanol or acetaldehyde were produced in the gas phase from the CO sub(2) reduction with water by titania nanoparticles modified by Pd and Rh for improved reactivity. The modified photocata-lysts synthesized by the improved sol-gel method were tested under UV light irradiation. The quantum efficiency of the internally illuminated monolith reactor was near one order of magnitude higher than the slurry batch annular reactor. This efficiency was due to the reactor's flexible configuration; which allows maximum exploitation of the combined advantages of the high surface area of the monolith and the elimination of uneven light distribution via the optical fibres.
ISSN:0926-3373
DOI:10.1016/j.apcatb.2012.07.024