We request 6 days on IRIS to study the diffusion of adsorbed gas molecules (H2, CH4, C2H2, C2H4, C2H6) within a functional porous metal-organic framework (MOF) as a function of gas loading and temperature. The proposed study will reveal the nature of the diffusion of the gas molecules; that is of particular interest owing to the selective hydrocarbon uptakes exhibited by this MOF. Furthermore the data obtained from the QENS study will enable the activation energy of the diffusion to be quantified and the geometry of the binding sites to be determined. These studies on the kinetic aspect of the gas adsorption have significant impact on the practical application of this MOF material for hydrocarbon separation.