Documents disponibles écrits par cet auteur

Multiobjective optimization of a porous ceramic membrane reactor for oxidative coupling of methane / Mohammad R. Quddus in Industrial & engineering chemistry research, Vol. 49 N° 14 (Juillet 2010) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 49 N° 14 (Juillet 2010) . - pp. 6469–6481 Titre : Multiobjective optimization of a porous ceramic membrane reactor for oxidative coupling of methane Type de document : texte imprimé Auteurs : Mohammad R. Quddus, Auteur ; Yan Zhang, Auteur ; Ajay K. Ray, Auteur Année de publication : 2010 Article en page(s) : pp. 6469–6481 Note générale : Industrial chemistry Langues : Anglais (eng) Mots-clés : Optimization  Porous  ceramic  membrane Résumé : Multiobjective optimization of a porous ceramic membrane reactor for oxidative coupling of methane has been studied with the elitist nondominated sorting genetic algorithm with jumping genes (NSGA-II-aJG). A mathematical model was first developed and “tuned” using some experimental results available in the literature. A parametric sensitivity analysis was carried out on the experimentally verified model to systematically investigate the effects of the process parameters on the performance of the membrane reactor. Several two objective optimization problems were performed at both operating and design stages using NSGA-II-aJG. Significant performance improvement in terms of C2 yield and selectivity could be achieved when rigorous optimization was performed. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie900971p [article] Multiobjective optimization of a porous ceramic membrane reactor for oxidative coupling of methane [texte imprimé] / Mohammad R. Quddus, Auteur ; Yan Zhang, Auteur ; Ajay K. Ray, Auteur . - 2010 . - pp. 6469–6481. Industrial chemistry Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 49 N° 14 (Juillet 2010) . - pp. 6469–6481 Mots-clés : Optimization  Porous  ceramic  membrane Résumé : Multiobjective optimization of a porous ceramic membrane reactor for oxidative coupling of methane has been studied with the elitist nondominated sorting genetic algorithm with jumping genes (NSGA-II-aJG). A mathematical model was first developed and “tuned” using some experimental results available in the literature. A parametric sensitivity analysis was carried out on the experimentally verified model to systematically investigate the effects of the process parameters on the performance of the membrane reactor. Several two objective optimization problems were performed at both operating and design stages using NSGA-II-aJG. Significant performance improvement in terms of C2 yield and selectivity could be achieved when rigorous optimization was performed. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie900971p

Reduction kinetics of la modified NiO / La - γAl2O3 oxygen carrier for chemical - looping combustion / Mohammad M. Hossain 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. 11009–11017 Titre : Reduction kinetics of la modified NiO / La - γAl2O3 oxygen carrier for chemical - looping combustion Type de document : texte imprimé Auteurs : Mohammad M. Hossain, Auteur ; Mohammad R. Quddus, Auteur ; Hugo I. Lasa, Auteur Année de publication : 2011 Article en page(s) : pp. 11009–11017 Note générale : Chimie industrielle Langues : Anglais (eng) Mots-clés : Kinetics  Oxygen  Combustion Résumé : La modified Ni/La-γAl2O3 oxygen carrier reduction kinetics is investigated using temperature programmed reduction (TPR) and a parameter nonlinear regression analysis. TPR profile study and XRD analysis of the completely oxidized samples show that NiO is the prevalent phase of the oxygen carrier. Hydrogen pulse chemisorption demonstrates that the nickel crystallite sizes remain unchanged over repeated reduction/oxidation cycles. A nucleation and nuclei growth model and an unreacted shrinking core model are developed based on the oxygen carrier characterization. Model discrimination is conducted based on SSQ, goodness of fittings, and minimum cross-correlation coefficients. On the basis of these statistical indicators, it is established that the random nucleation model describes the reduction of the oxygen carrier adequately. The estimated value of the activation energy for the La modified Ni/La-γAl2O3 sample is found to be 73.4 ± 2.6 kJ/mol, with this being significantly lower than the activation energy for the unmodified Ni/γAl2O3 sample (104.5 ± 3 kJ/mol). This suggests that the unmodified oxygen carrier requires higher activation energy, with this reflecting an increased difficulty of nickel phase reduction due to a strong interaction between nickel and alumina. The nucleation model, as established using TPR, is successfully validated for the reduction cycle using methane as a fuel gas in a CREC minifluidized riser simulator reactor operating under the expected operating conditions for large industrial scale chemical-looping combustion (CLC) units. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie100424w [article] Reduction kinetics of la modified NiO / La - γAl2O3 oxygen carrier for chemical - looping combustion [texte imprimé] / Mohammad M. Hossain, Auteur ; Mohammad R. Quddus, Auteur ; Hugo I. Lasa, Auteur . - 2011 . - pp. 11009–11017. Chimie industrielle Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 49 N° 21 (Novembre 2010) . - pp. 11009–11017 Mots-clés : Kinetics  Oxygen  Combustion Résumé : La modified Ni/La-γAl2O3 oxygen carrier reduction kinetics is investigated using temperature programmed reduction (TPR) and a parameter nonlinear regression analysis. TPR profile study and XRD analysis of the completely oxidized samples show that NiO is the prevalent phase of the oxygen carrier. Hydrogen pulse chemisorption demonstrates that the nickel crystallite sizes remain unchanged over repeated reduction/oxidation cycles. A nucleation and nuclei growth model and an unreacted shrinking core model are developed based on the oxygen carrier characterization. Model discrimination is conducted based on SSQ, goodness of fittings, and minimum cross-correlation coefficients. On the basis of these statistical indicators, it is established that the random nucleation model describes the reduction of the oxygen carrier adequately. The estimated value of the activation energy for the La modified Ni/La-γAl2O3 sample is found to be 73.4 ± 2.6 kJ/mol, with this being significantly lower than the activation energy for the unmodified Ni/γAl2O3 sample (104.5 ± 3 kJ/mol). This suggests that the unmodified oxygen carrier requires higher activation energy, with this reflecting an increased difficulty of nickel phase reduction due to a strong interaction between nickel and alumina. The nucleation model, as established using TPR, is successfully validated for the reduction cycle using methane as a fuel gas in a CREC minifluidized riser simulator reactor operating under the expected operating conditions for large industrial scale chemical-looping combustion (CLC) units. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie100424w