Aluminium oxide film was formed inside tube-wall by electrical anodic oxidation and Pt was loaded on the film for oxidation of carbon monoxide. The anodic films were turned out porous Al₂O₃ having the structure of amorphous Υ-Al₂O₃ and polygonal cells from the analysis of XRD, FT-IR, SEM, and SEM-EDX. The aluminium tube anodized at 18V for 90 minute was selected for the test reaction of the oxidation of CO. The model proposed by Senkan et al. was adapted in our study and tested against experimental data. It was demonstrated that the reactor was not diffusion limited and that kinetic resistance must be included in this study.