Acetaldehyde degradation under UV and visible irradiation using CeO sub(2)-TiO sub(2) composite systems: Evaluation of the photocatalytic efficiencies

The photocatalytic activity under UV and visible irradiation of a series of CeO sub(2)-TiO sub(2) composite materials prepared by microemulsion and subsequently calcined at 500 degree C was evaluated using acetaldehyde as a model pollutant. The activities of three composite catalysts containing 2.5,...

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Bibliographic Details
Published in:Chemical engineering journal (Lausanne, Switzerland : 1996) Switzerland : 1996), 2014-11, Vol.255, p.297-306
Main Authors: Munoz-Batista, Mario J, Ballari, Maria de los Milagros, Kubacka, Anna, Cassano, Alberto E, Alfano, Orlando M, Fernandez-Garcia, Marcos
Format: Article
Language:English
Subjects:
Catalysis
Catalysts
Computational efficiency
Computing time
Mathematical models
Optical properties
Photocatalysis
Titanium dioxide
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Summary:The photocatalytic activity under UV and visible irradiation of a series of CeO sub(2)-TiO sub(2) composite materials prepared by microemulsion and subsequently calcined at 500 degree C was evaluated using acetaldehyde as a model pollutant. The activities of three composite catalysts containing 2.5, 5 and 25 M% of ceria, as well as a nano-titania reference are compared by means of efficiency parameters; the quantum (or true) efficiency, as well as the photonic (or apparent) efficiency were evaluated. To this end, the lamp emission properties, as well as the radiation field interaction with the catalyst inside the reactor were modeled and numerically calculated. For the evaluation of the radiation absorbed by the catalysts, the optical properties of the materials were measured and a radiative transfer model that considers all potential optical events was built up. The stability of the systems under reaction conditions was also studied. Overall, the results evidence that the composite containing 2.5 Ce mol% outperforms titania by a factor of at least 2, irrespective of the illumination source used in the experiment. This shows the potential of the CeO sub(2)-TiO sub(2) composites, a highly active and stable system, for sunlight optimum profiting.
ISSN:1385-8947
DOI:10.1016/j.cej.2014.06.056