Iron catalysts supported on silica alumina and mesoporous material, beside non supported iron nanoparticles, were studied. The preparation of supported catalysts occurred by incipient wetness impregnation method with aqueous solutions of iron chloride to give 2 percent or 5 percent of metal. One iron catalyst supported on silica alumina was prepared by the method of urea, in which an appropriate amount of an aqueous solution of FeCl3·6H2O (99 percent - Merck) was mixed with urea for impregnation. The samples were characterized by measurements of N2 physisorption, X-ray diffraction (XRD), temperature programmed reduction with (TPR), transmission electron microscopy (TEM). The amount of metal embedded in each sample was determined using atomic absorption spectroscopy (AAS). The silica alumina and mesoporous silica supports were also characterized by thermogravimetric analysis (DTA/TGA). The textural properties showed that after introduction of the metal into the supports, the specific area, pore volume and pore diameter decreased as the metal content was increased. XRD analysis with Rietveld refinement showed the formation of phases the following phases FeO, Fe3O4, Fe0, for all supported samples. Reduction profiles (TPR) for the supported iron samples showed mainly two reduction regions, assigned for Fe2O3 to FeO and for FeO to Fe0, respectively.