Abstract
The catalytic dehydrogenation of cyclohexane to benzene (C 6H 12 ⇌ C 6H 6 + 3H 2 has been studied in a gas chromatographic reactor. An enhancement of product yield above equilibrium has been observed and direct evidence for equilibrium displacement obtained by the observation of a maximisation of yield at an optimum flow-rate. This optimisation is a result of the effects of flow-rate on peak broadening by longitudinal diffusion, an aspect which has been omitted in theoretical treatments of chromatographic reactors. Further studies with a longer reactor showed considerably greater yields but no maximisation. In this case three product peaks were obtained. However, it has been shown that all three peaks are in fact benzene and not benzene precursors, e.g. cyclohexane and cyclohexa-1,3-diene has been made and the mechanistic and chromatographic implications of this have been discussed.
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