Revista Facultad de Ingeniería Universidad de Antioquia
Print version ISSN 0120-6230
DAZA, Carlos Enrique; MONDRAGON, Fanor; MORENO, Sonia and MOLINA, Rafael. CO2 reforming of methane over Ni-Mg-Al-Ce mixed oxides derived from hydrotalcites: Mg/Ni ratio effect. Rev.fac.ing.univ. Antioquia [online]. 2011, n.57, pp. 66-74. ISSN 0120-6230.
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.
Keywords : Hydrotalcite; cerium; reforming; methane; syngas.