Boundary Layer of Photon Absorption Applied to Heterogeneous Photocatalytic Solar Flat Plate Reactor DesignReportar como inadecuado




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International Journal of Photoenergy - Volume 2014 2014, Article ID 930439, 8 pages -

Research Article

GAOX Group, Chemical Engineering School, Universidad del Valle, A.A. 25360 Cali, Colombia

Photocatalysis and Solar Photoreactors Engineering, Department of Chemical Engineering, Universidad de Cartagena, A.A. 1382 Cartagena, Colombia

Received 28 February 2014; Accepted 12 May 2014; Published 5 June 2014

Academic Editor: Hong Liu

Copyright © 2014 Héctor L. Otálvaro-Marín 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.

Abstract

This study provides information to design heterogeneous photocatalytic solar reactors with flat plate geometry used in treatment of effluents and conversion of biomass to hydrogen. The concept of boundary layer of photon absorption taking into account the efficient absorption of radiant energy was introduced; this concept can be understood as the reactor thickness measured from the irradiated surface where 99% of total energy is absorbed. Its thickness and the volumetric rate of photons absorption VRPA were used as design parameters to determine i reactor thickness, ii maximum absorbed radiant energy, and iii the optimal catalyst concentration. Six different commercial brands of titanium dioxide were studied: Evonik-Degussa P-25, Aldrich, Merck, Hombikat, Fluka, and Fisher. The local volumetric rate of photon absorption LVRPA inside the reactor was described using six-flux absorption-scattering model SFM applied to solar radiation. The radiation field and the boundary layer thickness of photon absorption were simulated with absorption and dispersion effects of catalysts in water at different catalyst loadings. The relationship between catalyst loading and reactor thickness that maximizes the absorption of radiant energy was obtained for each catalyst by apparent optical thickness. The optimum concentration of photocatalyst Degussa P-25 was 0.2 g-l in 0.86 cm of thickness, and for photocatalyst Aldrich it was 0.3 g-l in 0.80 cm of thickness.





Autor: Héctor L. Otálvaro-Marín, Miguel Angel Mueses, and Fiderman Machuca-Martínez

Fuente: https://www.hindawi.com/



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