材料科学
尿素
三元运算
热液循环
化学工程
相(物质)
形态学(生物学)
比表面积
金属
催化作用
有机化学
化学
冶金
生物
计算机科学
工程类
遗传学
程序设计语言
作者
Rosario Suarez Anzorena,Fernando F. Muñoz,Lucía M. Toscani,Pablo Ricardo Bonelli,Ana Lea Cukierman,Susana A. Larrondo
标识
DOI:10.1016/j.ceramint.2022.05.243
摘要
Nano-crystalline Ce0.9Zr0.1-xSmxO2-δ (0 ≤ x ≤ 0.10) mixed oxides were synthesized for the first time by a urea-hydrothermal method without the use of template or structure directing agents. The use of a high molar ratio of urea to metal cations and temperature reaction ensures the formation of a single-phase homogeneous ternary solid solution. The (NH4)2Ce(NO3)6 precursor, in a greater proportion, together with urea acts as a structure directing agent towards the completion of a self-assembly shuttle to dumbbells to sphere sequence. The analysis of the obtained morphologies has demonstrated that the physicochemical nature of the doping precursor in solution has a strong influence on the final morphology without losing morphological control. Thus, the ZrO(NO3)2 precursor favors the formation of cauliflower-type particles whereas Sm(NO3)3 favors the formation of spheres. As a result, the morphology of the samples evolves from cauliflowers to spheres as Sm content increases in the mixed oxides, with a great effect on the high specific surface area (80–115 m2.g−1) and total pore volume (0.109–0.315 cm3.g−1) obtained in all cases. Solids reduce in three stages reaching high reduction percentages (≈50%).
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