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Detailed reaction kinetics for the dehydrogenation of methylcyclohexane over Pt catalyst / Muhammad Usman in Industrial & engineering chemistry research, Vol. 51 N° 1 (Janvier 2012) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 51 N° 1 (Janvier 2012) . - pp. 158–170 Titre : Detailed reaction kinetics for the dehydrogenation of methylcyclohexane over Pt catalyst Type de document : texte imprimé Auteurs : Muhammad Usman, Auteur ; David Cresswell, Auteur ; Arthur Garforth, Auteur Année de publication : 2012 Article en page(s) : pp. 158–170 Note générale : Chimie industrielle Langues : Anglais (eng) Mots-clés : Kinetics Résumé : Detailed reaction kinetics of the dehydrogenation of methylcyclohexane were studied over an in-house-prepared 1.0 wt % Pt/γ-Al2O3 catalyst. Experiments were conducted in a fixed-bed reactor for a wide range of operating conditions including reactions without hydrogen in the feed. Kinetic model equations were developed, and the experimental data were analyzed according to the power-law, Langmuir–Hinshelwood–Hougen–Watson (LHHW), and Horiuti–Polanyi kinetic mechanisms. The rate of loss of the first hydrogen molecule in the LHHW single-site surface reaction mechanism was found to be the rate-controlling step. Experiments with 1-methylcyclohexene confirmed that the rate-controlling step does not lie after the loss of the first hydrogen molecule. DEWEY : 660 ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie201539v [article] Detailed reaction kinetics for the dehydrogenation of methylcyclohexane over Pt catalyst [texte imprimé] / Muhammad Usman, Auteur ; David Cresswell, Auteur ; Arthur Garforth, Auteur . - 2012 . - pp. 158–170. Chimie industrielle Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 51 N° 1 (Janvier 2012) . - pp. 158–170 Mots-clés : Kinetics Résumé : Detailed reaction kinetics of the dehydrogenation of methylcyclohexane were studied over an in-house-prepared 1.0 wt % Pt/γ-Al2O3 catalyst. Experiments were conducted in a fixed-bed reactor for a wide range of operating conditions including reactions without hydrogen in the feed. Kinetic model equations were developed, and the experimental data were analyzed according to the power-law, Langmuir–Hinshelwood–Hougen–Watson (LHHW), and Horiuti–Polanyi kinetic mechanisms. The rate of loss of the first hydrogen molecule in the LHHW single-site surface reaction mechanism was found to be the rate-controlling step. Experiments with 1-methylcyclohexene confirmed that the rate-controlling step does not lie after the loss of the first hydrogen molecule. DEWEY : 660 ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie201539v

Long - term deactivation of supported Pt catalysts in the dehydrogenation of methylcyclohexane to toluene / Faisal Alhumaidan in Industrial & engineering chemistry research, Vol. 49 N° 20 (Octobre 2010) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 49 N° 20 (Octobre 2010) . - pp. 9764–9770 Titre : Long - term deactivation of supported Pt catalysts in the dehydrogenation of methylcyclohexane to toluene Type de document : texte imprimé Auteurs : Faisal Alhumaidan, Auteur ; David Cresswel, Auteur ; Arthur Garforth, Auteur Année de publication : 2011 Article en page(s) : pp. 9764–9770 Note générale : Chimie industrielle Langues : Anglais (eng) Mots-clés : kinetics  Methylcyclohexane Résumé : The kinetics of methylcyclohexane (MCH) dehydrogenation over supported Pt catalysts was successfully described by a non-Langmuirian/noncompetitive Horiuti−Polanyi model (Ind. Eng. Chem. Res., in press). The daily reversible and irreversible deactivation, associated with activity tests, was satisfactorily included in the dehydrogenation model. The objective of this work is to incorporate the long-term deactivation of Pt catalysts, associated with life or deactivation tests, in the kinetic model. This has been successfully achieved by assuming that the long-term deactivation is the sum of two exponential decay processes, one rapid and completed in a few days, while the other is slow with a half-life of weeks to months. DEWEY : 660 ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie1013025 [article] Long - term deactivation of supported Pt catalysts in the dehydrogenation of methylcyclohexane to toluene [texte imprimé] / Faisal Alhumaidan, Auteur ; David Cresswel, Auteur ; Arthur Garforth, Auteur . - 2011 . - pp. 9764–9770. Chimie industrielle Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 49 N° 20 (Octobre 2010) . - pp. 9764–9770 Mots-clés : kinetics  Methylcyclohexane Résumé : The kinetics of methylcyclohexane (MCH) dehydrogenation over supported Pt catalysts was successfully described by a non-Langmuirian/noncompetitive Horiuti−Polanyi model (Ind. Eng. Chem. Res., in press). The daily reversible and irreversible deactivation, associated with activity tests, was satisfactorily included in the dehydrogenation model. The objective of this work is to incorporate the long-term deactivation of Pt catalysts, associated with life or deactivation tests, in the kinetic model. This has been successfully achieved by assuming that the long-term deactivation is the sum of two exponential decay processes, one rapid and completed in a few days, while the other is slow with a half-life of weeks to months. DEWEY : 660 ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie1013025