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Analysis of photocatalytic reactors employing the photonic efficiency and the removal efficiency parameters: degradation of radiation absorbing and nonabsorbing pollutants / Gerd Sagawe in Industrial & engineering chemistry research, Vol. 49 N° 15 (Août 2010) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 49 N° 15 (Août 2010) . - pp 6898–6908 Titre : Analysis of photocatalytic reactors employing the photonic efficiency and the removal efficiency parameters: degradation of radiation absorbing and nonabsorbing pollutants Type de document : texte imprimé Auteurs : Gerd Sagawe, Auteur ; Maria L. Satuf, Auteur ; Rodolfo J. Brandi, Auteur Année de publication : 2010 Article en page(s) : pp 6898–6908 Note générale : Chimie industrielle Langues : Anglais (eng) Mots-clés : Photocatalytic  reactors  Photonic  Nonabsorbing  pollutants. Résumé : The photocatalytic degradation of radiation absorbing and nonabsorbing pollutants in slurry reactors is analyzed in terms of two performance parameters: the observed photonic efficiency (OPE) and the removal efficiency (RE) [Sagawe et al. Chem. Eng. Sci. 2003, 58, 2587]. The OPE proposal permits a simple approach to analyze complex reacting systems. Conversely, to calculate the RE, the modeling of radiation absorption and scattering inside the reactors is necessary, which requires the determination of the optical properties of the catalyst and the modeling of the optical effects of the reactor walls. The degradation of dichloroacetic acid, phenol, and 4-nitrophenol was studied employing aeroxide TiO2 P25 from Evonik-Degussa in well-mixed batch reactors irradiated by UV lamps. 4-Nitrophenol has the particular characteristic to compete with titania for the absorption of photons in the employed wavelength range of irradiation. Two reaction kinetics proposals were considered to interpret experimental data: a “photocatalytic” Langmuir−Hinshelwood model (the L-HPh model) and a “photocatalytic” Langmuir−Hinshelwood linear model (the L-HPh/1 model). The good agreement observed between experimental results and model simulations confirms the usefulness of the proposed OPE approximation and the more accurate information provided by the RE performance parameter. The inclusion of 4-nitrophenol allowed inference of the situation that would be encountered when treating real samples contaminated with strong radiation absorbing compounds. DEWEY : 660 ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie901753k [article] Analysis of photocatalytic reactors employing the photonic efficiency and the removal efficiency parameters: degradation of radiation absorbing and nonabsorbing pollutants [texte imprimé] / Gerd Sagawe, Auteur ; Maria L. Satuf, Auteur ; Rodolfo J. Brandi, Auteur . - 2010 . - pp 6898–6908. Chimie industrielle Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 49 N° 15 (Août 2010) . - pp 6898–6908 Mots-clés : Photocatalytic  reactors  Photonic  Nonabsorbing  pollutants. Résumé : The photocatalytic degradation of radiation absorbing and nonabsorbing pollutants in slurry reactors is analyzed in terms of two performance parameters: the observed photonic efficiency (OPE) and the removal efficiency (RE) [Sagawe et al. Chem. Eng. Sci. 2003, 58, 2587]. The OPE proposal permits a simple approach to analyze complex reacting systems. Conversely, to calculate the RE, the modeling of radiation absorption and scattering inside the reactors is necessary, which requires the determination of the optical properties of the catalyst and the modeling of the optical effects of the reactor walls. The degradation of dichloroacetic acid, phenol, and 4-nitrophenol was studied employing aeroxide TiO2 P25 from Evonik-Degussa in well-mixed batch reactors irradiated by UV lamps. 4-Nitrophenol has the particular characteristic to compete with titania for the absorption of photons in the employed wavelength range of irradiation. Two reaction kinetics proposals were considered to interpret experimental data: a “photocatalytic” Langmuir−Hinshelwood model (the L-HPh model) and a “photocatalytic” Langmuir−Hinshelwood linear model (the L-HPh/1 model). The good agreement observed between experimental results and model simulations confirms the usefulness of the proposed OPE approximation and the more accurate information provided by the RE performance parameter. The inclusion of 4-nitrophenol allowed inference of the situation that would be encountered when treating real samples contaminated with strong radiation absorbing compounds. DEWEY : 660 ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie901753k

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