Abstract

Parastoo Dezvareh¹, Hamidreza Aghabozorg², Moayad Hossaini Sadr³ and Karim Zare²

DOI : http://dx.doi.org/10.13005/ojc/340337

La_1-xCe_xNi_1-yZr_yO₃ 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 samples³¹. 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 CO₂. The catalyst La_0.9Ce_0.1Ni_0.8Zr_0.2O₃ perovskite provides the highest catalytic performance. CH₄ conversion was more than 60%, CO₂ conversion was more than70% and the H₂/CO molar ratio was ~1, respectively. Catalytic activity of La_1-xCe_xNi_1-yZr_yO₃ 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: LaNiO₃ > La_0.9Ce_0.1Ni_0.8Zr_0.2O₃ > La_0.9Ce_0.1Ni_0.9Zr_0.1O₃ > La_0.9Ce_0.1NiO₃

Nanocatalyst; Catalytic Performance; Perovskite; Dry Reforming of Methane (Drm)

[ View HTML Full Text]