Synthesis and Characterization of Core-Shell NiO@Al2O3 with High Ni/Al Ratio and High Calcination Temperature

Abstract

Nanomaterials have made significant advancements in various applications, particularly in the field of catalysis. The limited lifespan of nickel-based catalysts due to sintering at high temperatures has presented a challenge that requires innovative solutions. This research focuses on the synthesis and characterization of core-shell materials designed to protect nickel from sintering occurring at temperatures around 600°C. NiO@Al₂O₃ samples were synthesized using the chemical reduction method and aluminum isopropoxide hydrolysis, with variations in the nickel-to-alumina ratio during calcination at 800°C. The samples were characterized using XRD and N₂ adsorption-desorption to assess crystallinity, crystallite size, surface area, pore diameter, and pore volume. The results demonstrate the successful formation of NiO encapsulated within alumina (NiO@Al₂O₃), minimizing nickel agglomeration and aggregation, as indicated by the conducted characterizations. These findings enable the development of catalysts with high stability and extended lifespans for various high-temperature nickel-based catalytic reactions.