Laboratory-scale photomineralization of <mml:math id="E1" xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mi>n</mml:mi></mml:math>-alkanes in gaseous phase by photocatalytic membranes immobilizing titanium dioxide

Bellobono, Ignazio Renato; Stanescu, Rodica; Costache, Cristina; Canevali, Carmen; Morazzoni, Franca; Scotti, Roberto; Bianchi, Riccardo; Mangone, Emilia Simona; de Martini, Giulia; Tozzi, Paola Maria

doi:https://doi.org/10.1155/IJP/2006/73167

International Journal of Photoenergy

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Volume 2006 | Article ID 073167 | https://doi.org/10.1155/IJP/2006/73167

Laboratory-scale photomineralization of n-alkanes in gaseous phase by photocatalytic membranes immobilizing titanium dioxide

Ignazio Renato Bellobono,¹Rodica Stanescu,²Cristina Costache,²Carmen Canevali,³Franca Morazzoni,³Roberto Scotti,³Riccardo Bianchi,⁴Emilia Simona Mangone,⁵Giulia de Martini,⁵and Paola Maria Tozzi⁵

Received19 Feb 2006

Accepted04 May 2006

Published15 Aug 2006

Abstract

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.

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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.

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