In Situ MRI Study of 1-octene Isomerisation and Hydrogenation within a Trickle-bed Reactor
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13C DEPT-MRI is used to provide the ﬁrst spatial mapping of alkene isomerisation and hydrogenation during an alkene hydrogenation reaction occurring within a trickle-bed reactor. The implementation of a pulse sequence combining the spatial resolution of a magnetic resonance imaging (MRI) pulse sequence with a 13C DEPT magnetic resonance spectroscopy pulse sequence enables spatially resolved 13C spectra to be recorded of natural abundance 13C species. Observation of the 13C nucleus, which has a much larger chemical shift range than the 1H nucleus, provides spectra from which direct identiﬁcation of the products of isomerisation and hydrogenation is achieved. This technique is illustrated with respect to the hydrogenation of 1-octene over a 1 wt% Pd/Al2O3 catalyst. In this preliminary study we demonstrate the ability of this technique to identify the effect of changing the hydrogen ﬂow rate on the evolution of isomerisation and hydrogenation processes occurring along the length of the bed.
Key words:DEPT MRI trickle-bed reactor hydrogenation magnetic resonance imaging
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