Serviços Personalizados
Journal
Artigo
Indicadores
Citado por SciELO
Acessos
Links relacionados
Citado por Google
Similares em SciELO
Similares em Google
Compartilhar
Revista Facultad de Ingeniería Universidad de Antioquia
versão impressa ISSN 0120-6230versão On-line ISSN 2422-2844
Resumo
DAZA, Carlos Enrique; MONDRAGON, Fanor; MORENO, Sonia e 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.
Palavras-chave : Hydrotalcite; cerium; reforming; methane; syngas.