Documents disponibles écrits par cet auteur

Appraisal of a De - NOx system based on H2 for light - duty diesel engine vehicles / Samir Bensaid in Industrial & engineering chemistry research, Vol. 49 N° 21 (Novembre 2010) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 49 N° 21 (Novembre 2010) . - pp. 10323-10333 Titre : Appraisal of a De - NOx system based on H2 for light - duty diesel engine vehicles Type de document : texte imprimé Auteurs : Samir Bensaid, Auteur ; Edoardo Merlone Borla, Auteur ; Nunzio Russo, Auteur Année de publication : 2011 Article en page(s) : pp. 10323-10333 Note générale : Chimie industrielle Langues : Anglais (eng) Mots-clés : Diesel  engine Résumé : The present paper describes a novel, fully integrated after-treatment system based on the use of hydrogen for de-NOx purposes, designed for light-duty diesel engine applications. Hydrogen is generated by an autothermal reformer, placed as a bypass unit of the close-coupled DOC and DPF, and it promotes an NO, reduction in a specific catalytic converter in the under-floor position. The results of the tests on commercial reforming catalysts and on H2-selected catalytic reductions (SCR) perovskite catalysts that were synthesized by our group are presented. The best catalyst, on the basis of TPRe activity tests, was La0.8Sr0.2Fe0.9Pd0.1O3. At a lab-scale, the fuel penalty of the system is around 4% for an NOx to N2 conversion of 60%, under the best operating conditions. T50 is very low (150 °C) compared to other de-NO, strategies. The system was then integrated on board a vehicle, and several testing protocols were performed (NEDC2000 cycle, stationary driving conditions on the roller test bench, and real driving conditions on the road). It has been demonstrated that the system is able to work independently in many driving conditions and that the reforming reaction can be effectively controlled and maintained. The NOx emissions were kept below Euro 6 levels, even though undesired CO and HC secondary emissions were produced. This performance was reached with a fuel penalty of 10%. Although this value is presently too high to envisage direct application on the market, it has been demonstrated that this technology is already fully functional on board a real vehicle, which encourages further refining research activity. ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=23447923 [article] Appraisal of a De - NOx system based on H2 for light - duty diesel engine vehicles [texte imprimé] / Samir Bensaid, Auteur ; Edoardo Merlone Borla, Auteur ; Nunzio Russo, Auteur . - 2011 . - pp. 10323-10333. Chimie industrielle Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 49 N° 21 (Novembre 2010) . - pp. 10323-10333 Mots-clés : Diesel  engine Résumé : The present paper describes a novel, fully integrated after-treatment system based on the use of hydrogen for de-NOx purposes, designed for light-duty diesel engine applications. Hydrogen is generated by an autothermal reformer, placed as a bypass unit of the close-coupled DOC and DPF, and it promotes an NO, reduction in a specific catalytic converter in the under-floor position. The results of the tests on commercial reforming catalysts and on H2-selected catalytic reductions (SCR) perovskite catalysts that were synthesized by our group are presented. The best catalyst, on the basis of TPRe activity tests, was La0.8Sr0.2Fe0.9Pd0.1O3. At a lab-scale, the fuel penalty of the system is around 4% for an NOx to N2 conversion of 60%, under the best operating conditions. T50 is very low (150 °C) compared to other de-NO, strategies. The system was then integrated on board a vehicle, and several testing protocols were performed (NEDC2000 cycle, stationary driving conditions on the roller test bench, and real driving conditions on the road). It has been demonstrated that the system is able to work independently in many driving conditions and that the reforming reaction can be effectively controlled and maintained. The NOx emissions were kept below Euro 6 levels, even though undesired CO and HC secondary emissions were produced. This performance was reached with a fuel penalty of 10%. Although this value is presently too high to envisage direct application on the market, it has been demonstrated that this technology is already fully functional on board a real vehicle, which encourages further refining research activity. ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=23447923

Enzymatic hydrolysis of lignocellulosic biomasses via CFD and experiments / Danilo Carvajal in Industrial & engineering chemistry research, Vol. 51 N° 22 (Juin 2012) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 51 N° 22 (Juin 2012) . - pp. 7518–7525 Titre : Enzymatic hydrolysis of lignocellulosic biomasses via CFD and experiments Type de document : texte imprimé Auteurs : Danilo Carvajal, Auteur ; Daniele L. Marchisio, Auteur ; Samir Bensaid, Auteur Année de publication : 2012 Article en page(s) : pp. 7518–7525 Note générale : Industrial chemistry Langues : Anglais (eng) Mots-clés : Enzymatic  Hydrolysis  Biomasses Résumé : The time evolution of the rheological properties of pretreated Arundo slurries has been estimated, during enzymatic hydrolysis for bioethanol production, by computational fluid dynamics simulations in conjunction with experimental tests on a laboratory scale anchor reactor with different solid concentrations (18.5 and 27.5% w/w) and stirring velocities (50–200 rpm). The simulations were carried out with Fluent 6.2 using the moving reference frame approach and the Herschel–Bulkley rheological model. Great care was taken in the development of the computational grid and in the solution of the numerical issues. The identification of the rheological parameters was successful and the results are consistent with other works published in the literature on similar systems. The next steps of this work will involve the use of these results to design new continuous reactors for enzymatic hydrolysis and their scale up to a pilot and industrial level. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie201673t [article] Enzymatic hydrolysis of lignocellulosic biomasses via CFD and experiments [texte imprimé] / Danilo Carvajal, Auteur ; Daniele L. Marchisio, Auteur ; Samir Bensaid, Auteur . - 2012 . - pp. 7518–7525. Industrial chemistry Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 51 N° 22 (Juin 2012) . - pp. 7518–7525 Mots-clés : Enzymatic  Hydrolysis  Biomasses Résumé : The time evolution of the rheological properties of pretreated Arundo slurries has been estimated, during enzymatic hydrolysis for bioethanol production, by computational fluid dynamics simulations in conjunction with experimental tests on a laboratory scale anchor reactor with different solid concentrations (18.5 and 27.5% w/w) and stirring velocities (50–200 rpm). The simulations were carried out with Fluent 6.2 using the moving reference frame approach and the Herschel–Bulkley rheological model. Great care was taken in the development of the computational grid and in the solution of the numerical issues. The identification of the rheological parameters was successful and the results are consistent with other works published in the literature on similar systems. The next steps of this work will involve the use of these results to design new continuous reactors for enzymatic hydrolysis and their scale up to a pilot and industrial level. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie201673t