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Experimental and kinetic study of iow temperature selective catalytic reduction of NO with NH3 over the V2O5/AC catalyst / Zhigang Lei in Industrial & engineering chemistry research, Vol. 50 N° 9 (Mai 2011) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 50 N° 9 (Mai 2011) . - pp. 5360-5368 Titre : Experimental and kinetic study of iow temperature selective catalytic reduction of NO with NH3 over the V2O5/AC catalyst Type de document : texte imprimé Auteurs : Zhigang Lei, Auteur ; Aibin Long, Auteur ; Cuiping Wen, Auteur Année de publication : 2011 Article en page(s) : pp. 5360-5368 Note générale : Chimie industrielle Langues : Anglais (eng) Mots-clés : Catalyst  Selective  catalytic  reduction  Low  temperature  Kinetics Résumé : Selective catalytic reduction (SCR) of NO (nitric oxide) by NH3 (ammonia) at temperatures of393-523 K over AC (activated carbon) supported V2O5 (vanadium pentoxide) was investigated in this work. The V2O5/AC catalyst was prepared by the pore volume impregnation method. The intrinsic kinetics for this catalyst was first measured in the absence of internal and external diffusions in a fixed-bed microreactor. Then, five intrinsic kinetic models, i.e. the Eley-Rideal model, the Langmuir―Hinshelwood model, the Mars-van Krevelen model, the first-order model, and the power-rate law model, were applied to correlate the experimental data. Among them, the Eley-Rideal model is the most accurate, and the Langmuir-Hinshelwood model is unfeasible for describing SCR of NO by NH3 over the V2O5/AC catalyst. Therefore, the SCR of NO with NH3 over V2O5/AC is likely to Follow the Eley-Rideal mechanism in light ofintrinsic kinetic measurements. Finally, the kinetic equations were incorporated into a 3D mathematical model for monolithic honeycomb reactor, and it was found that the Eley-Rideal model is more suitable and can provide useful information for future application in the actual industrial plants. DEWEY : 660 ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=24128658 [article] Experimental and kinetic study of iow temperature selective catalytic reduction of NO with NH3 over the V2O5/AC catalyst [texte imprimé] / Zhigang Lei, Auteur ; Aibin Long, Auteur ; Cuiping Wen, Auteur . - 2011 . - pp. 5360-5368. Chimie industrielle Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 50 N° 9 (Mai 2011) . - pp. 5360-5368 Mots-clés : Catalyst  Selective  catalytic  reduction  Low  temperature  Kinetics Résumé : Selective catalytic reduction (SCR) of NO (nitric oxide) by NH3 (ammonia) at temperatures of393-523 K over AC (activated carbon) supported V2O5 (vanadium pentoxide) was investigated in this work. The V2O5/AC catalyst was prepared by the pore volume impregnation method. The intrinsic kinetics for this catalyst was first measured in the absence of internal and external diffusions in a fixed-bed microreactor. Then, five intrinsic kinetic models, i.e. the Eley-Rideal model, the Langmuir―Hinshelwood model, the Mars-van Krevelen model, the first-order model, and the power-rate law model, were applied to correlate the experimental data. Among them, the Eley-Rideal model is the most accurate, and the Langmuir-Hinshelwood model is unfeasible for describing SCR of NO by NH3 over the V2O5/AC catalyst. Therefore, the SCR of NO with NH3 over V2O5/AC is likely to Follow the Eley-Rideal mechanism in light ofintrinsic kinetic measurements. Finally, the kinetic equations were incorporated into a 3D mathematical model for monolithic honeycomb reactor, and it was found that the Eley-Rideal model is more suitable and can provide useful information for future application in the actual industrial plants. DEWEY : 660 ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=24128658

Selective catalytic reduction for NO removal / Zhigang Lei in Industrial & engineering chemistry research, Vol. 50 N° 10 (Mai 2011) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 50 N° 10 (Mai 2011) . - pp 5942–5951 Titre : Selective catalytic reduction for NO removal : comparison of transfer and reaction performances among monolith catalysts Type de document : texte imprimé Auteurs : Zhigang Lei, Auteur ; Cuiping Wen, Auteur ; Jie Zhang, Auteur Année de publication : 2011 Article en page(s) : pp 5942–5951 Note générale : Chimie industrielle Langues : Anglais (eng) Mots-clés : Monolith  catalysts Résumé : One of the available technologies that can effectively control the emission of NOx is the selective catalytic reduction (SCR) of NOx with ammonia (NH3). Monolith catalysts are widely used in this technology due to their unique advantages that they offer, like low pressure drop, high external geometric surface area, and resistance to deposition of carbon, dust, and metals from combustion process. But the configuration of monolith catalysts has prominent influence on transfer and reaction performances of SCR for NO removal. This work tries to provide an easy-to-read and comprehensive comparison of momentum transfer, heat transfer, mass transfer, and reaction performance between two types of monolith catalysts with five kinds of channel shapes for SCR for NO removal, and to address the issues specific to SCR applications as to (i) whether or not monolith catalysts can improve the transfer and reaction performances compared to traditional pellet packed-bed reactors; (ii) which type of monolith catalysts and (iii) which kind of channel shapes for each type are optimum from the viewpoint of chemical reaction engineering. It was found that monolith catalysts have a much lower pressure drop and higher effectiveness factor than traditional pellet packed-bed reactors, and a coating catalyst seems more suitable than an extruded catalyst for SCR for NO removal. Although a round channel brings the best heat and mass transfer, a triangle-shaped channel of coating catalyst possesses the highest NOx conversion due to the chemical reaction being the controlling step. DEWEY : 660 ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie102206x [article] Selective catalytic reduction for NO removal : comparison of transfer and reaction performances among monolith catalysts [texte imprimé] / Zhigang Lei, Auteur ; Cuiping Wen, Auteur ; Jie Zhang, Auteur . - 2011 . - pp 5942–5951. Chimie industrielle Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 50 N° 10 (Mai 2011) . - pp 5942–5951 Mots-clés : Monolith  catalysts Résumé : One of the available technologies that can effectively control the emission of NOx is the selective catalytic reduction (SCR) of NOx with ammonia (NH3). Monolith catalysts are widely used in this technology due to their unique advantages that they offer, like low pressure drop, high external geometric surface area, and resistance to deposition of carbon, dust, and metals from combustion process. But the configuration of monolith catalysts has prominent influence on transfer and reaction performances of SCR for NO removal. This work tries to provide an easy-to-read and comprehensive comparison of momentum transfer, heat transfer, mass transfer, and reaction performance between two types of monolith catalysts with five kinds of channel shapes for SCR for NO removal, and to address the issues specific to SCR applications as to (i) whether or not monolith catalysts can improve the transfer and reaction performances compared to traditional pellet packed-bed reactors; (ii) which type of monolith catalysts and (iii) which kind of channel shapes for each type are optimum from the viewpoint of chemical reaction engineering. It was found that monolith catalysts have a much lower pressure drop and higher effectiveness factor than traditional pellet packed-bed reactors, and a coating catalyst seems more suitable than an extruded catalyst for SCR for NO removal. Although a round channel brings the best heat and mass transfer, a triangle-shaped channel of coating catalyst possesses the highest NOx conversion due to the chemical reaction being the controlling step. DEWEY : 660 ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie102206x