Documents disponibles écrits par cet auteur

Modeling and experimental verification of a corrugated plate photocatalytic reactor using computational fluid dynamics / Claudio Passalia in Industrial & engineering chemistry research, Vol. 50 N° 15 (Août 2011) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 50 N° 15 (Août 2011) . - pp. 9077–9086 Titre : Modeling and experimental verification of a corrugated plate photocatalytic reactor using computational fluid dynamics Type de document : texte imprimé Auteurs : Claudio Passalia, Auteur ; Orlando M. Alfano, Auteur ; Rodolfo J. Brandi, Auteur Année de publication : 2011 Article en page(s) : pp. 9077–9086 Note générale : Chimie industrielle Langues : Anglais (eng) Mots-clés : Photocatalytic  Computational  fluid  dynamics Résumé : Heterogeneous photocatalysis is a suitable technology for eliminating indoor pollutants at low concentration ranges. In this work we deal with the modeling and experimental evaluation of a continuous, single-pass, corrugated plate photocatalytic reactor for elimination of gaseous formaldehyde in air. The reactor configuration consists of a corrugated stainless steel plate coated with titanium dioxide catalyst, irradiated from both sides with UV lamps. The complete modeling of the reactor was achieved by means of a commercial CFD tool. Nonetheless, the radiative transfer within the reactor was modeled externally, considering the lamps emission and the radiative interaction between reactor windows and catalytic walls by the computation of view factors. The reaction kinetics was also imposed externally from previous determined parameters. The conditions of the experimental runs were replicated in the computational simulations. Model predictions of the formaldehyde overall conversion showed good agreement with experiments, with a root-mean-square error less than 4%. DEWEY : 660 ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie200756t [article] Modeling and experimental verification of a corrugated plate photocatalytic reactor using computational fluid dynamics [texte imprimé] / Claudio Passalia, Auteur ; Orlando M. Alfano, Auteur ; Rodolfo J. Brandi, Auteur . - 2011 . - pp. 9077–9086. Chimie industrielle Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 50 N° 15 (Août 2011) . - pp. 9077–9086 Mots-clés : Photocatalytic  Computational  fluid  dynamics Résumé : Heterogeneous photocatalysis is a suitable technology for eliminating indoor pollutants at low concentration ranges. In this work we deal with the modeling and experimental evaluation of a continuous, single-pass, corrugated plate photocatalytic reactor for elimination of gaseous formaldehyde in air. The reactor configuration consists of a corrugated stainless steel plate coated with titanium dioxide catalyst, irradiated from both sides with UV lamps. The complete modeling of the reactor was achieved by means of a commercial CFD tool. Nonetheless, the radiative transfer within the reactor was modeled externally, considering the lamps emission and the radiative interaction between reactor windows and catalytic walls by the computation of view factors. The reaction kinetics was also imposed externally from previous determined parameters. The conditions of the experimental runs were replicated in the computational simulations. Model predictions of the formaldehyde overall conversion showed good agreement with experiments, with a root-mean-square error less than 4%. DEWEY : 660 ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie200756t

New pilot-plant photo-fenton solar reactor for water decontamination / Jorgelina Farias in Industrial & engineering chemistry research, Vol. 49 N° 3 (Fevrier 2010)

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 49 N° 3 (Fevrier 2010) . - pp. 1265–1273 Titre : New pilot-plant photo-fenton solar reactor for water decontamination Type de document : texte imprimé Auteurs : Jorgelina Farias, Auteur ; Enrique D. Albizzati, Auteur ; Orlando M. Alfano, Auteur Année de publication : 2010 Article en page(s) : pp. 1265–1273 Note générale : Industrial chemistry Langues : Anglais (eng) Mots-clés : New  Pilot-Plant--Photo-Fenton--Solar  Reactor--Water--Decontamination Résumé : A theoretical and experimental study of a new pilot-plant solar reactor for the photo-Fenton treatment of waters containing toxic organic compounds is presented. This hybrid unit was designed and built to capture thermal and photochemical solar radiation, yielding higher degradation rates of a model pollutant. The mass and thermal energy balances and the radiative transfer equation are solved to compute the pollutant and hydrogen peroxide concentrations and the reaction temperature as a function of time. The spectral UV/visible and broadband solar radiation incident on the reactor window are estimated from a computational code: the Simple Model for the Atmospheric Radiative Transfer of Sunshine (SMARTS2) program. Under irradiated runs, an experimental temperature increase up to 25 °C is reached. Also, for a reaction time of 180 min and a relatively low iron concentration, the combined effect of UV/visible and thermal sunlight is able to degrade 98.2% of the initial pollutant concentration. ISSN : 0888-5885 [article] New pilot-plant photo-fenton solar reactor for water decontamination [texte imprimé] / Jorgelina Farias, Auteur ; Enrique D. Albizzati, Auteur ; Orlando M. Alfano, Auteur . - 2010 . - pp. 1265–1273. Industrial chemistry Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 49 N° 3 (Fevrier 2010) . - pp. 1265–1273 Mots-clés : New  Pilot-Plant--Photo-Fenton--Solar  Reactor--Water--Decontamination Résumé : A theoretical and experimental study of a new pilot-plant solar reactor for the photo-Fenton treatment of waters containing toxic organic compounds is presented. This hybrid unit was designed and built to capture thermal and photochemical solar radiation, yielding higher degradation rates of a model pollutant. The mass and thermal energy balances and the radiative transfer equation are solved to compute the pollutant and hydrogen peroxide concentrations and the reaction temperature as a function of time. The spectral UV/visible and broadband solar radiation incident on the reactor window are estimated from a computational code: the Simple Model for the Atmospheric Radiative Transfer of Sunshine (SMARTS2) program. Under irradiated runs, an experimental temperature increase up to 25 °C is reached. Also, for a reaction time of 180 min and a relatively low iron concentration, the combined effect of UV/visible and thermal sunlight is able to degrade 98.2% of the initial pollutant concentration. ISSN : 0888-5885

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