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The direct epoxidation of propene in the explosive regime in a microreactor — a study into the reaction kinetics / T. Alexander Nijhuis 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. 10479–10485 Titre : The direct epoxidation of propene in the explosive regime in a microreactor — a study into the reaction kinetics Type de document : texte imprimé Auteurs : T. Alexander Nijhuis, Auteur ; Jiaqi Chen, Auteur ; Stefanie M. A. Kriescher, Auteur Année de publication : 2011 Article en page(s) : pp. 10479–10485 Note générale : Chimie industrielle Langues : Anglais (eng) Mots-clés : Microreactor  Kinetics Résumé : The usage of a microreactor system for the direct epoxidation of propene over a gold-titania-based catalyst system using a mixture of hydrogen, oxygen, and propene allows for the safe operation of the reaction in the explosive regime. A kinetic study was performed on the effect of the concentration of hydrogen, oxygen, and propene on the reaction rate as well as the catalyst deactivation and reactivation. A simple algebraic expression was developed, based on published kinetics, which provided the three reaction rate constants as a function of the feed gas concentrations. It is shown that the propene concentration does not influence the propene oxide formation rate; however, higher propene concentrations significantly reduce the catalyst deactivation rate. Hydrogen increases the rate of the epoxidation reaction, while it only has a minor influence on the rate of deactivation and reactivation. Oxygen has a beneficial effect on the epoxidation reaction: it slightly decreases the deactivation rate and is beneficial for the catalyst reactivation. It is shown that, for the gold on titania dispersed on a silica catalyst used in this study, it is advantageous to perform the direct propene epoxidation in a microreactor system at the highest possible feed concentrations for each of the reactants. This results in the highest propene oxide productivity and the lowest deactivation rate. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie1004306 [article] The direct epoxidation of propene in the explosive regime in a microreactor — a study into the reaction kinetics [texte imprimé] / T. Alexander Nijhuis, Auteur ; Jiaqi Chen, Auteur ; Stefanie M. A. Kriescher, Auteur . - 2011 . - pp. 10479–10485. Chimie industrielle Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 49 N° 21 (Novembre 2010) . - pp. 10479–10485 Mots-clés : Microreactor  Kinetics Résumé : The usage of a microreactor system for the direct epoxidation of propene over a gold-titania-based catalyst system using a mixture of hydrogen, oxygen, and propene allows for the safe operation of the reaction in the explosive regime. A kinetic study was performed on the effect of the concentration of hydrogen, oxygen, and propene on the reaction rate as well as the catalyst deactivation and reactivation. A simple algebraic expression was developed, based on published kinetics, which provided the three reaction rate constants as a function of the feed gas concentrations. It is shown that the propene concentration does not influence the propene oxide formation rate; however, higher propene concentrations significantly reduce the catalyst deactivation rate. Hydrogen increases the rate of the epoxidation reaction, while it only has a minor influence on the rate of deactivation and reactivation. Oxygen has a beneficial effect on the epoxidation reaction: it slightly decreases the deactivation rate and is beneficial for the catalyst reactivation. It is shown that, for the gold on titania dispersed on a silica catalyst used in this study, it is advantageous to perform the direct propene epoxidation in a microreactor system at the highest possible feed concentrations for each of the reactants. This results in the highest propene oxide productivity and the lowest deactivation rate. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie1004306