The Xerogel alumina catalyst was prepared by sol-gel method in non-aqueous milieu, and the aerogel alumina catalyst was prepared in the same method but it was dried at by supercritical conditions. These catalysts were characterized by XRD, BET, and chemical adsorption methods. The obtained results were compared to show the effect of preparation process on the structural properties of the alumina. Besides these results were compared with some oxides supported on alumina, and the effect of distribution of these oxides on the properties of alumina was investigated too.