Initial INS measurements on industrial grade iron-based Fischer-Tröpsch (F-T) catalysts have been very successful and have established the presence of a hydrocarbonaceous overlayer at the gas-solid interface. However, follow-up experiments on iron-based catalysts prepared at the academic centre have highlighted complications in the catalyst activation procedures used in the acquisition of INS spectra of F-T catalysts. The proposed work seeks to use the recently commissioned ISIS catalyst test equipment to overcome these challenges, in order to obtain INS spectra for samples under reaction conditions that directly correspond to traditional micro-reactor measurements.