Mass transfer and convection effects in small-scale catalytic hydrogenation
Date
2017-06
Authors
Luo, Jingwei
Wu, Yang
Zijlstra, Harmen S.
Harrington, David A.
McIndoe, J. Scott
Journal Title
Journal ISSN
Volume Title
Publisher
Catalysis Science & Technology
Abstract
Rhodium-catalyzed hydrogenation of alkynes was studied under conditions of low concentration of substrate and either one or two equivalents of hydrogen using pressurized sample infusion electrospray ionization mass spectrometry (PSI-ESI-MS). Four sample vials of the same volume but of different diameter enabled the investigation of the effects of surface area on reaction rates. Running the same experiments with stirring on or off allowed further details to emerge, notably the obvious effects of convection thanks to the localized sampling technique employed. Modelling of the system allowed for a better understanding of the relative importance of the various factors in play (reaction rate, surface area, mass transfer, convection). These factors should be carefully considered when studying or optimizing reactions involving narrow reaction flasks, especially when those flasks are unstirred.
Description
Keywords
diffusion, convection, hydrogenation, mass spectrometry, real-time analysis, interfacial mass transfer
Citation
Luo, J., Wu, Y., Zijlstra, H.S., Harrington, D.A. & McIndoe, J.S. (2017). Mass transfer and convection effects in small-scale catalytic hydrogenation. Catalysis Science & Technology, 12(7), 2609-2615. https://doi.org/10.1039/C7CY00492C