Production of Complex Cerium-Aluminum Oxides Using an Atmospheric Pressure Plasma Torch
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- 作者：Claudia Luhrs ; Jonathan Phillips ; Paul T. Fanson
- 刊名：Langmuir
- 出版年：2007
- 出版时间：June 19, 2007
- 年：2007
- 卷：23
- 期：13
- 页码：7055 - 7064
- 全文大小：1693K
- 年卷期：v.23,no.13(June 19, 2007)
- ISSN：1520-5827
文摘
Ceria-alumina particles of a wide variety of structures, from micrometer-sized hollow spheres to nanoparticles,were produced from aerosols of different natures, but all derived from nitrate salts passed through a low power (<1000W) atmospheric pressure plasma torch. The amount of water present with the nitrate salts was found to significantlyaffect the morphology of the resulting material. A model was proposed that explains the mechanism in which wateracts as a blowing agent to create hollow metal oxide spheres that then shatter to form metal oxide nanoparticles. Furtherexamination of the nanoparticles revealed that they display a core/shell morphology in which the core material iscrystalline CeO2 and the shell material is amorphous Al2O3. These unique core/shell materials are interesting candidatesfor catalyst support materials with high thermal durability. In addition, experiments have shown that the nanoparticlescan be readily converted into CeAlO3 perovskite.