FeMgO system was prepared by three different methods. The samples were nominated as FeMgOIM, FeMgOCo and FeMgOHY due to preparation by impregnation, co-precipitation and hydrothermal, respectively. The catalysts were characterized by TGA, XRD, FTIR, EPR, S-BET and TEM techniques. The catalytic properties of these samples were investigated by using H2O2 decomposition at (25-35 degrees C) and partial oxidation of methanol at (300-400 degrees C). FeMgOHY sample showed the highest catalytic activity toward H2O2 decomposition. FeMgOCo sample showed the highest catalytic activity toward partial oxidation of methanol. The results showed the sensitivity of H2O2 decomposition reaction to the surface concentration of active species. While partial oxidation of methanol is sensitive to surface texture, solids interaction between active phase and support. All catalysts are highly selective to formaldehyde at reaction temperature 300 degrees C. FeMgOCo and FeMgOIM catalysts showed high catalytic activity and stability toward partial oxidation of methanol with reusing. (c) 2013 Elsevier Ltd. All rights reserved.