This work present a preliminary study on the synthesis of macroporous membranes of magnesium oxide with a homogeneous and a narrow range of porosity obtained by a reproducible technique, which aims their future application in the separation of gaseous substances impossible to separate by conventional techniques. The membranes were obtained by the sintering of the respective nanoparticles which were obtained by the sol-gel/nanotemplate technique, using a magnesium nitrate as the main precursor and polyvinyl alcohol, PVA, as a template of the nanostructures. Pressure and Temperature were the sintering parameters evaluated in the present research. The samples obtained were analyzed by SEM, XRD, BET, and Intrusion Mercury Porosimetry (IMP). The results show uniformity in the particles size of the material, confirming the sintering process. The average crystallite size was 160nm, and the average grain size was 450nm, the samples showing better properties were those sintered at 1000 and 1100 Celsius degrees at a pressure of 173MPa, and 1000 Celsius degrees at 260MPa. The range macroporosity obtained limit with the mesoporosity, nearly 97 per cent of the macropores is between 50 and 150nm radius. The results indicate that the technique is reproducible and the pores range is reasonably small, this will allow to apply the membrane in the separation of certain substances.