The effect of confining liquids has great importance in many areas and is particular interest in liquid phase heterogeneous catalysis. Metal catalysts supported on porous materials are widely used for instance in the catalysed hydrogenation of benzene to cyclohexane1, a reaction of significant commercial interest due to the use of cyclohexane as a precursor in the production of nylon, as well as environmental applications such as the removal of benzene from fuels. The diffusion process is often the rate limiting step in any catalytic reaction and so investigation of the diffusion of liquids inside the pores is of critical importance. The use of a support structure with such regular pore structure and pore size distribution shows clear advantages in terms of both diffusion processes and dispersion of metal catalysts. It is therefore of great interest to measure the diffusion process.