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Photocatalytic degradation of dichloroacetic acid / María de los Milagros Ballari in Industrial & engineering chemistry research, Vol. 48 N°4 (Février 2009) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 48 N°4 (Février 2009) . - pp. 1847–1858 Titre : Photocatalytic degradation of dichloroacetic acid : a kinetic study with a mechanistically based reaction model Type de document : texte imprimé Auteurs : María de los Milagros Ballari, Auteur ; Orlando M. Alfano, Auteur ; Alberto E. Cassano, Auteur Année de publication : 2009 Article en page(s) : pp. 1847–1858 Note générale : Chemical engineering Langues : Anglais (eng) Mots-clés : Dichloroacetic  acid  Photocatalytic  degradation  UV  radiation  Titanium  dioxide  suspensions  Kinetic  model Résumé : In the present work, a study of the reaction kinetics of the photocatalytic degradation of dichloroacetic acid (DCA) employing UV radiation and titanium dioxide suspensions is reported. This study involved the development of a kinetic model from a proposed complete reaction sequence and estimation of the kinetic parameters from experimental data. The experimental data were obtained using a perfect mixed photoreactor, because the operating conditions were chosen in compliance with restrictive conditions established in a previous work in which the possibility of mass-transfer limitations in slurry reactors was investigated. The significant variables in this study were (1) the initial DCA concentration, (2) the catalyst loading, and (3) the light intensity. Simulation results from the complete reactor mass balance, including radiation transport in the bulk and resistances inside the catalytic particle agglomeration, are in good agreement with experiments, which provides confidence in the estimation of the kinetic parameters within the range of the explored variables. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie801194f [article] Photocatalytic degradation of dichloroacetic acid : a kinetic study with a mechanistically based reaction model [texte imprimé] / María de los Milagros Ballari, Auteur ; Orlando M. Alfano, Auteur ; Alberto E. Cassano, Auteur . - 2009 . - pp. 1847–1858. Chemical engineering Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 48 N°4 (Février 2009) . - pp. 1847–1858 Mots-clés : Dichloroacetic  acid  Photocatalytic  degradation  UV  radiation  Titanium  dioxide  suspensions  Kinetic  model Résumé : In the present work, a study of the reaction kinetics of the photocatalytic degradation of dichloroacetic acid (DCA) employing UV radiation and titanium dioxide suspensions is reported. This study involved the development of a kinetic model from a proposed complete reaction sequence and estimation of the kinetic parameters from experimental data. The experimental data were obtained using a perfect mixed photoreactor, because the operating conditions were chosen in compliance with restrictive conditions established in a previous work in which the possibility of mass-transfer limitations in slurry reactors was investigated. The significant variables in this study were (1) the initial DCA concentration, (2) the catalyst loading, and (3) the light intensity. Simulation results from the complete reactor mass balance, including radiation transport in the bulk and resistances inside the catalytic particle agglomeration, are in good agreement with experiments, which provides confidence in the estimation of the kinetic parameters within the range of the explored variables. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie801194f

Photocatalytic reactor employing titanium dioxide / Roberto L. Romero in Industrial & engineering chemistry research, Vol. 48 N° 23 (Décembre 2009) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 48 N° 23 (Décembre 2009) . - pp. 10456–10466 Titre : Photocatalytic reactor employing titanium dioxide : from a theoretical model to realistic experimental results Type de document : texte imprimé Auteurs : Roberto L. Romero, Auteur ; Orlando M. Alfano, Auteur ; Alberto E. Cassano, Auteur Année de publication : 2010 Article en page(s) : pp. 10456–10466 Note générale : Industrial chemistry Langues : Anglais (eng) Mots-clés : Photocatalytic--Reactor--Employing--Titanium  Dioxide--Theoretical--Model--Realistic  Experimental--Results Résumé : The performance of a reacting system for degradation of trichloroethylene (TCE) in a pilot-size annular photocatalytic reactor having a tubular lamp located at its centerline was studied. The reactor operation was carried out with commercial catalytic particles of titanium dioxide (Aldrich) in a water suspension. The description of the reactor performance was made by employing a kinetic model developed in a laboratory reactor of different size and configuration, irradiated with similar lamps of lower output power. The annular reactor was operated in the continuous mode but inside the loop of a recirculation system.The performance of the annular reactor was modeled by assuming three different behaviors: (i) a well-stirred tank reactor, (ii) a pseudo-steady-state laminar flow reactor in a batch recycle, and (iii) a transient-state laminar flow reactor in a recycle. Case iii produced the best representation of the experimental data. Along with the experimental validation of the developed theoretical models, three practical features were unveiled that had to be taken into account in any subsequent design: (a) an important change in the pH, from 6.5 to 3.5, along the reaction time; (b) a significant titanium dioxide deposition on the reactor walls; and (c) an appreciable catalyst agglomeration produced by the recirculation system and magnified by the change in pH. Only after the first 120 min of reaction time, the reactor conditions became almost stabilized; thus, the observed transformations had to be incorporated into the modeling. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie900354y [article] Photocatalytic reactor employing titanium dioxide : from a theoretical model to realistic experimental results [texte imprimé] / Roberto L. Romero, Auteur ; Orlando M. Alfano, Auteur ; Alberto E. Cassano, Auteur . - 2010 . - pp. 10456–10466. Industrial chemistry Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 48 N° 23 (Décembre 2009) . - pp. 10456–10466 Mots-clés : Photocatalytic--Reactor--Employing--Titanium  Dioxide--Theoretical--Model--Realistic  Experimental--Results Résumé : The performance of a reacting system for degradation of trichloroethylene (TCE) in a pilot-size annular photocatalytic reactor having a tubular lamp located at its centerline was studied. The reactor operation was carried out with commercial catalytic particles of titanium dioxide (Aldrich) in a water suspension. The description of the reactor performance was made by employing a kinetic model developed in a laboratory reactor of different size and configuration, irradiated with similar lamps of lower output power. The annular reactor was operated in the continuous mode but inside the loop of a recirculation system.The performance of the annular reactor was modeled by assuming three different behaviors: (i) a well-stirred tank reactor, (ii) a pseudo-steady-state laminar flow reactor in a batch recycle, and (iii) a transient-state laminar flow reactor in a recycle. Case iii produced the best representation of the experimental data. Along with the experimental validation of the developed theoretical models, three practical features were unveiled that had to be taken into account in any subsequent design: (a) an important change in the pH, from 6.5 to 3.5, along the reaction time; (b) a significant titanium dioxide deposition on the reactor walls; and (c) an appreciable catalyst agglomeration produced by the recirculation system and magnified by the change in pH. Only after the first 120 min of reaction time, the reactor conditions became almost stabilized; thus, the observed transformations had to be incorporated into the modeling. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie900354y