Methane adsorption in nanoporous carbons pre-impregnated with n-nonane gives rise to a large improvement in the amount adsorbed compared to the dry carbon. This improvement must be associated with the formation of methane/hydrocarbon nanostructures in the confined space inside narrow micropores, i.e., the high adsorption potential favors specific arrangements not observed in bulk systems. Inelastic Neutron Scaterring (INS) can be a useful tool to ascertain the structure of these CH4 molecules entrapped within the n-nonane.