Two series of LaNi x Al 1−x O 3 catalysts (0 ≤ x ≤ 1) were prepared by hydrothermal and sol-gel methods and characterized by X-ray diffraction (XRD), BET surface area, Temperature programmed reduction (TPR) and Fourier-transform infrared spectroscopy (FT-IR) techniques. The performance of these catalysts was studied for CO 2 reforming of methane (also called dry reforming of methane, DRM) at atmospheric pressure and in the temperature range of 600−800 • C, maintaining a space velocity of 28,800 h −1. Catalysts containing trimetallic perovskite showed higher CH 4 and CO 2 conversions than the bimetallic perovskite, due to the strong interaction of Ni with the former. Strong interaction increased the reduction temperature of the active species and reduced the sintering of metallic particles. At 800 • C, the sol-gel catalysts reached their maximum activity in terms of both CH 4 and CO 2 conversions at x = 0.3, whereas the same for hydrothermal catalysts required a Ni ratio x = 0.6. The trimetallic perovskite formation was responsible for the catalyst stability. A comparison of the best catalysts from the two series revealed that the hydrothermal catalysts exhibited a slightly better performance during the time on stream analysis. The results are interpreted in terms of changes in the physicochemical properties of the catalysts.
Partially Mg-substituted LaCoO3perovskite is a good precursor, for the generation of cobalt nanoparticle derived under the reduction atmosphere. The La2O2CO3phase formed is more efficient in removing the carbon from the cobalt active site.
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