Laboratory-scale photomineralization of n-alkanes in gaseous phase by photocatalytic membranes immobilizing titanium dioxideReport as inadecuate

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International Journal of Photoenergy - Volume 2006 2006, Article ID 73167, 8 pages

Environmental Research Centre, University of Milan, Via C. Golgi 19, Milan 20133, Italy

Department of Inorganic Technology and Environmental Protection, Faculty of Industrial Chemistry, Polytechnic University of Bucharest, Bucharest 011061, Romania

Department of Materials Science, University of Milano Bicocca, Milan 20126, Italy

CNR, ISTM, Institute of Molecular Sciences and Technologies, Milan 20133, Italy

R&D Group, BIT srl, Milan 20121, Italy

Received 19 February 2006; Accepted 4 May 2006

Copyright © 2006 Ignazio Renato Bellobono et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


Kinetics of photocatalytic oxidation of methane, ethane, and n-heptane, to yield intermediates, and photomineralization of intermediates, to yield carbon dioxide and water, was studied in the gaseous phase, at 308±2 K, by a laboratory-scale photoreactor and photocatalytic membranes immobilizing 30±3 wt.% of TiO2, in the presence of aerosolized stoichiometric hydrogen peroxide as oxygen donor, and at a relative humidity close to 100%. The whole volume of irradiated solution was 4.000±0.005 L, the ratio between this volume and the geometrical apparent surface of the irradiated side of the photocatalytic membrane was 3.8±0.1 cm, and the absorbed power was 0.30 W-cm cylindrical geometry. The pinetic parameters of the present work substantially coincide with those of the same molecules previously studied in aqueous solution, within the limits of experimental uncertainty. Photocatalytic processes thus appear to be controlled by interface phenomena, which are ruled kinetically, and apparently also thermodynamically, by concentration gradients, independently on diffusion and other processes in the aqueous or gaseous bulk, if turbulence in these phases is adequately assured.

Author: Ignazio Renato Bellobono, Rodica Stanescu, Cristina Costache, Carmen Canevali, Franca Morazzoni, Roberto Scotti, Riccardo Bianchi



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