Design and fabrication of a high-throughput microreactor and its evaluation for highly exothermic reactions / Nageswara Rao Peela in Industrial & engineering chemistry research, Vol. 51 N° 50 (Décembre 2012)  

Public ISBD [article]  inIndustrial & engineering chemistry research > Vol. 51 N° 50 (Décembre 2012) . - pp. 16270–16277 Titre : Design and fabrication of a high-throughput microreactor and its evaluation for highly exothermic reactions Type de document : texte imprimé Auteurs : Nageswara Rao Peela, Auteur ; Ivan C. Lee, Auteur ; Dionisios G. Vlachos, Auteur Année de publication : 2013 Article en page(s) : pp. 16270–16277 Note générale : Industrial chemistry Langues : Anglais (eng) Mots-clés : Microreactor Résumé : The effect of distributor and channel positions on flow uniformity in a high-throughput reactor is studied using a COMSOL MULTIPHYSICS, CFD package. The best design is subsequently fabricated and evaluated for propane total oxidation reaction at low conversions. Comparison of our design with a literature design is also presented. The results indicate that the conical distributor performs significantly better in terms of flow uniformity as compared to the commonly used disc shaped distributor. The flow uniformity is improved when the central channel is removed from the design, indicating that the channel arrangement also affects the flow uniformity. The experimental results on flow uniformity are in good agreement with simulation. The deviation in conversion of propane from channel to channel is within experimental error, indicating that the reactor can reliably screen catalysts and deliver kinetics. A half a dozen catalysts were tested for complete propane oxidation using the developed technology. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie302093u [article] Design and fabrication of a high-throughput microreactor and its evaluation for highly exothermic reactions [texte imprimé] / Nageswara Rao Peela, Auteur ; Ivan C. Lee, Auteur ; Dionisios G. Vlachos, Auteur . - 2013 . - pp. 16270–16277. Industrial chemistry Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 51 N° 50 (Décembre 2012) . - pp. 16270–16277 Mots-clés : Microreactor Résumé : The effect of distributor and channel positions on flow uniformity in a high-throughput reactor is studied using a COMSOL MULTIPHYSICS, CFD package. The best design is subsequently fabricated and evaluated for propane total oxidation reaction at low conversions. Comparison of our design with a literature design is also presented. The results indicate that the conical distributor performs significantly better in terms of flow uniformity as compared to the commonly used disc shaped distributor. The flow uniformity is improved when the central channel is removed from the design, indicating that the channel arrangement also affects the flow uniformity. The experimental results on flow uniformity are in good agreement with simulation. The deviation in conversion of propane from channel to channel is within experimental error, indicating that the reactor can reliably screen catalysts and deliver kinetics. A half a dozen catalysts were tested for complete propane oxidation using the developed technology. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie302093u

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Steam reforming of ethanol in a microchannel reactor / Nageswara Rao Peela in Industrial & engineering chemistry research, Vol. 50 N° 23 (Décembre 2011)  

Public ISBD [article]  inIndustrial & engineering chemistry research > Vol. 50 N° 23 (Décembre 2011) . - pp. 12881-12894 Titre : Steam reforming of ethanol in a microchannel reactor : kinetic study and reactor simulation Type de document : texte imprimé Auteurs : Nageswara Rao Peela, Auteur ; Deepak Kunzru, Auteur Année de publication : 2012 Article en page(s) : pp. 12881-12894 Note générale : Chimie industrielle Langues : Anglais (eng) Mots-clés : Reactor Kinetics Microreactor Steam reforming Résumé : The kinetics of steam reforming of ethanol (SRE) was determined at atmospheric pressure in the temperature range of 450―550 °C over 2% Rh/20% CeO2/Al2O3 in a microchannel reactor. The product distribution could be explained by a reaction scheme consisting of four reactions: reaction of steam with ethanol, decomposition of ethanol, methane steam reforming, and the water-gas shift reaction. The kinetic expression based on Langmuir―Hinshelwood kinetics could explain the experimental data satisfactorily. A two-dimensional simulation was also carried out to predict the performance of a microchannel SRE reactor in which the endothermic heat of reaction was supplied by the co-current flow of a hot gas in the adjacent channel. The performance of the coupled reactor/heat exchange system was evaluated by varying several parameters such as heating side gas velocity and temperature, width of the channel, weight of the catalyst, reactor inlet temperature, and inlet flow rate. DEWEY : 660 ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=25267446 [article] Steam reforming of ethanol in a microchannel reactor : kinetic study and reactor simulation [texte imprimé] / Nageswara Rao Peela, Auteur ; Deepak Kunzru, Auteur . - 2012 . - pp. 12881-12894. Chimie industrielle Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 50 N° 23 (Décembre 2011) . - pp. 12881-12894 Mots-clés : Reactor Kinetics Microreactor Steam reforming Résumé : The kinetics of steam reforming of ethanol (SRE) was determined at atmospheric pressure in the temperature range of 450―550 °C over 2% Rh/20% CeO2/Al2O3 in a microchannel reactor. The product distribution could be explained by a reaction scheme consisting of four reactions: reaction of steam with ethanol, decomposition of ethanol, methane steam reforming, and the water-gas shift reaction. The kinetic expression based on Langmuir―Hinshelwood kinetics could explain the experimental data satisfactorily. A two-dimensional simulation was also carried out to predict the performance of a microchannel SRE reactor in which the endothermic heat of reaction was supplied by the co-current flow of a hot gas in the adjacent channel. The performance of the coupled reactor/heat exchange system was evaluated by varying several parameters such as heating side gas velocity and temperature, width of the channel, weight of the catalyst, reactor inlet temperature, and inlet flow rate. DEWEY : 660 ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=25267446

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