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Keywords
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Keywords: Ce-substitution, perovskite, nanocatalyst, Citrate sol-gel method, dry reforming of methane (DRM)
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Abstract
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The La1-xCexNi0.4Fe0.6O3 (x = 0.1, 0.2 and 0.3) perovskite nanostructures were prepared via citrate sol-gel method. Synthesized samples were characterized by X-ray diffraction (XRD), temperature programmed reduction (TPR), and inductively coupled plasma (ICP) techniques. Specific surface area was determined by BET measurement. Scanning and transmission electron microscopy techniques were applied to study the morphology of the prepared samples. XRD patterns confirmed that a well-crystallized perovskite structure was formed in doping level up to x = 0.2. Morphology results showed that homogenous particles in the range of nanometers were obtained through the applied synthesis method. TPR analysis revealed that by increasing the doping level of Ce up to 0.2 in the prepared samples, reduction process shifted to lower temperatures. The addition of Ce to La1-xCexNi0.4Fe0.6O3 enhances the catalytic activity up to x = 0.2, but decreased significantly when x> 0.2. Catalytic activity of La1-xCexNi0.4Fe0.6O3 perovskites in dry reforming of methane (DRM) were: LaNiO3>La0.8Ce0.2Ni0.4Fe0.6O3>La0.9Ce0.1Ni0.4Fe0.6O3> LaNi0.4 Fe0.6O3>La0.7Ce0.3Ni0.4Fe0.6O3
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