Diffusion of a range of cyclic hydrocarbons relevant to the nylon production process will be measured in the potential catalyst Pt/MCM-41 in the context of the benzene hydrogenation reaction. Diffusion will be measured at a number of temperatures in order to gauge the effect of pi-bonding and aromaticity (and thus intermolecular interactions) on the mobility of these molecules. This work is part of a wider project where kinetics of the benzene hydrogenation in this catalyst reaction were successfully measured using neutron total scattering, concluding that mass transport played a crucial role in reaction progress. We aim to directly quantify this mass transport and factors affecting it. This work is also of a more general interest for considering the effect of liquid confinement in porous solids and factors dictating this effect.