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首页> 外文期刊>Catalysis science & technology >Mass transfer and convection effects in small-scale catalytic hydrogenation
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Mass transfer and convection effects in small-scale catalytic hydrogenation

机译：传质和对流效应小规模的催化加氢

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摘要

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.
机译：Rhodium-catalyzed炔烃的加氢研究了在低浓度的情况下基板和一个或两个的等价物氢使用加压注入样品电喷雾电离质谱(PSI-ESI-MS)。但不同直径的启用调查面积的影响反应率。搅拌或允许进一步的细节出现,特别是明显的对流的影响由于局部抽样技术就业。更好的理解的相对重要性发挥作用的各种因素(反应速率,表面积、传质对流)。因素时应该仔细考虑学习或优化反应涉及狭窄反应烧瓶,尤其是那些烧瓶没有被搅动的。

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