T V SAGAR
Articles written in Journal of Chemical Sciences
Volume 129 Issue 11 November 2017 pp 1787-1794 REGULAR ARTICLE
Two series of LaNixAl1−xO₃ 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 CO₂ 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 containingtrimetallic perovskite showed higher CH ₄ and CO₂ conversions than the bimetallic perovskite, due to the strong interaction of Ni with the former. Strong interaction increased the reduction temperature of the active speciesand reduced the sintering of metallic particles. At 800◦C, the sol–gel catalysts reached theirmaximum activity in terms of both CH ₄ and CO₂ 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.
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