CO2 reforming of methane over Ni-Mg-Al-Ce mixed oxides derived from hydrotalcites: Mg/Ni ratio effect

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), Therm...

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Bibliographic Details
Published in:Revista Facultad de Ingeniería 2013-02 (57), p.66-74
Main Authors: Daza, Carlos Enrique, Mondragón, Fanor, Moreno, Sonia, Molina, Rafael
Format: Article
Language:English
Subjects:
cerium
hydrotalcite
methane
reforming
syngas
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Summary: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 CO2Temperature-Programmed Desorption (TPD-CO2). The reduced catalysts were tested in CO2 reforming of methane under two operation regimens: i) reaction between 500 to 800ºC using volumetric ratios of CH4/CO2/Ar=5/5/40 and, ii) isothermal reaction at 700ºC 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.
ISSN:0120-6230
2422-2844
DOI:10.17533/udea.redin.14645