La 1-x Ce x Ni 1-y Zr y O 3 perovskite nanocatalysts were prepared by a method called citrate sol-gel. The samples were studied by the methods as X-ray diffraction (XRD), temperature programmed reduction (TPR), and inductively coupled plasma (ICP) technique.The BET method was used to determine the specific surface area. In addition, scanning and transmission electron microscopy techniques were employed to study the morphology of the prepared samples 31 . The XRD patterns confirmed the formation of perovskite with well-crystallized structure in doping level up to x= 0.1 and y= 0.2. The results of morphology studies revealed that homogenous particles in nanometer range were achieved. Based on the TPR analysis, reduction process occurred at higher temperatures and became difficult as the doping level of Zr increases. The catalytic performance was studied in dry reforming of methane (DRM) with CO 2 . The catalyst La 0.9 Ce 0.1 Ni 0.8 Zr 0.2 O 3 perovskite provides the highest catalytic performance. CH4 conversion was more than 60%, CO 2 conversion was more than70% and the H2/CO molar ratio was ~1, respectively. Catalytic activity of La 1-x Ce x Ni 1-y Zr y O 3 nanocatalysts was enhanced when the doping level of Zr (y) increased up to 0.2, and the following result was obtained for H2/CO ratio:
The La 1-x Ce x Ni 0.4 Fe 0.6 O 3 (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 La 1-x Ce x Ni 0.4 Fe 0.6 O 3 enhances the catalytic activity up to x = 0.2, but decreased significantly when x> 0.2. Catalytic activity of La 1-x Ce x Ni 0.4 Fe 0.6 O 3 perovskites in dry reforming of methane (DRM) were: LaNiO 3 >La 0
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