Methanol is synthesised from methane industrially in a two-step energy-intensive process via synthesis gas. Therefore, direct partial oxidation of methane to methanol at moderate conditions is of practical interest. Functionalisation of the C-H bond in methane for its selective oxidation to methanol is difficult due to the high reactivity of methanol and the inertness of the substrate methane. Fe-zeolite catalysts have been found to be active in catalysing methane oxidation in an aqueous phase system. The structure of the accessible active site became debatable: Hutchings and co-workers proposed binuclear Fe species as an active site for this system whereas, Yu.et.al., proposed a mononuclear Fe species, by means of in-situ EXAFS experiment for the same catalyst albeit at a lower iron loading. Adopting a single site catalysis technique helps to understand the active site nuclearity issues and bridges the gap between molecular and heterogeneous catalysis. So, our first objective is to demonstrate the activity of iron/copper ZSM-5 catalyst to understand the nuclearity of active site. The second objective is to perform the kinetic and mechanistic investigations of pre-formed mononuclear & binuclear iron complexes supported on zeolite-Y. Another limitation of this process is the solubility of methane in water. Solvents such as sulfolane have been proposed in the literature. Hence, more detailed investigations are proposed in this work to elucidate the role of the solvents for realising the maximum plausible methanol yield.