Reformado de metano con CO2 sobre óxidos mixtos Ni-Mg-Al-Ce derivados de hidrotalcitas: Efecto de la relación Mg/Ni

ni-ce/mg-al catalysts were obtained by means of the hydrotalcite reconstruction method in the presence of [ce(edta)]- complex. the effect of the mg/ni ratio was studied when the mixed oxide was reconstructed with 3 wt. % ce loadings. the materials were characterized by x-ray diffraction (xrd), thermal-gravimetric analysis (tga), temperature-programmed reduction (tpr-h2), temperature-programmed oxidation (tpo) and co2 temperature-programmed desorption (tpd-co2). the reduced catalysts were tested in co2 reforming of methane under two operation regimens: i) reaction between 500 to 800°c using volumetric ratios of ch4/co2/ ar=5/5/40 and, ii) isothermal reaction at 700°c using volumetric ratios of ch4/co2=18/22 without diluent gas. the solids showed strong basic characteristics and high ni-surface interactions which determined their catalytic performance. catalysts with mg/ni molar ratios of 2 and 4 showed high ch4 and co2 conversions with h2/co molar ratios between 0.7 and 1.1 without coke formation under severe isothermal reaction conditions. the yields and activities were higher when reduction increased.