The development of new porous metal-organic frameworks (MOFs) is receiving considerable attention worldwide owing to their potential for gas storage, separation, and purification. We seek to develop a highly novel ammonia storage system and request 6 days on IRIS to study the diffusion of adsorbed ammonia (NH3) molecules within two functional porous MOFs as a function of gas loading and temperature. The proposed study will reveal the nature of the diffusion of the NH3 molecules; that is of particular interest owing to the very high uptakes exhibited by these MOFs. Furthermore the data obtained from this 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 gas storage.