INTEC   05402
INSTITUTO DE DESARROLLO TECNOLOGICO PARA LA INDUSTRIA QUIMICA
Unidad Ejecutora - UE
capítulos de libros
Título:
Air Pollution: Kinetics of the Photocatalytic Degradation of Perchloroethylene in a Coated Plate Reactor
Autor/es:
IMOBERDORF, GUSTAVO EDUARDO; IRAZOQUI, HORACIO ANTONIO; ALFANO, ORLANDO MARIO; CASSANO, ALBERTO ENRIQUE
Libro:
Photocatalytic and Advanced Oxidation Technologies for Treatment of Air, Water, Soil and Surfaces
Editorial:
Redox Technologies, Inc.
Referencias:
Lugar: London, Ontario, Canada; Año: 2006; p. 203 - 211
Resumen:
Photocatalytic reactions based on TiO2 as the catalyst are an effective means for the elimination of volatile chlorinated organic compounds used as industrial solvents. Among them, perchloroethylene (PCE) is a toxic, carcinogenic and highly persistent pollutant. The design of photocatalytic reactors requires knowing the reaction mechanism through which the overall photocatalytic reaction proceeds, as well as the kinetics of every relevant reaction step taking part of it. Among these steps, those describing the interaction of the local radiation field with the catalytic surface are of primary importance. In this work, the kinetics of the photocatalytic degradation of PCE contaminating an air stream was studied. The experiments were carried out in a coated plate reactor operated under kinetic control regime, free of mass transfer interference. The TiO2 was deposited on a borosilicate glass plate as a thin film by means of a sol-gel technique. The effect of the PCE feed concentration and that of the relative humidity level on the degradation rate was studied, as well as its dependence on the light intensity. An expression of the intrinsic overall reaction rate was derived from a mechanism including the absorption of radiant energy on the catalytic surface as the primary step, followed by a detailed reaction sequence that involves Cl· as an active intermediate species. The proposed kinetic expression was validated with experimental results from the plate photoreactor operated as a differential one, and the kinetic parameters were determined by non-linear regression from those results.