In the present work are synthesized a series of oxides of the system of MgO/CaO, with different proportions in the cations, by the method of coprecipitation of Rao on carbonates precursors and their subsequent calcination to 1173 ºK. The carbonates precursors as the final oxides were analyzed by X Ray Fluorescence, Atomic Absorption and Neutronic Activation. The identification of the different crystalline phases are realized by X-rays Difraction and the presence of adsorbates carbonates species by Fourier Transformed lnfrared Spectroscopy.

In the present work are synthesized a series of oxides of the system of MgO/CaO, with different proportions in the cations, by the method of coprecipitation of Rao on carbonates precursors and their subsequent calcination to 1173 ºK. The carbonates precursors as the final oxides were analyzed by X Ray Fluorescence, Atomic Absorption and Neutronic Activation. The identification of the different crystalline phases are realized by X-rays Difraction and the presence of adsorbates carbonates species by Fourier Transformed lnfrared Spectroscopy.

Nickel -based catalysts were prepared by impregnation and subsequent calcination at a concentration of 10 % by weight on the following substrates : clay , Ti02 , Si02 and Al 203 . These were reduced in a stream of 20 % hydrogen / nitrogen at a temperature of 350 ° C for 2 hours and were characterized by X-ray diffraction with activity measurements determined that the different supports affects performance . The increasing order of performance of the catalysts with different supports in oil hydrogenation process is as follows: clay > Ti02 > at 20 3> Si02 . Activity results show that the clay has a good performance in the hydrogenation process reaching iodine decrease of sunflower oil from 150 076 to the value of 56.77 to a temperature of 280 ° C

Nickel -based catalysts were prepared by impregnation and subsequent calcination at a concentration of 10 % by weight on the following substrates : clay , Ti02 , Si02 and Al 203 . These were reduced in a stream of 20 % hydrogen / nitrogen at a temperature of 350 ° C for 2 hours and were characterized by X-ray diffraction with activity measurements determined that the different supports affects performance . The increasing order of performance of the catalysts with different supports in oil hydrogenation process is as follows: clay > Ti02 > at 20 3> Si02 . Activity results show that the clay has a good performance in the hydrogenation process reaching iodine decrease of sunflower oil from 150 076 to the value of 56.77 to a temperature of 280 ° C