3D navicular ceria micro/nanocomposite structure with multi-layered arrangement and its application in CO oxidation

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• 作者：Yangang Wang ; Fengyuan Zhang ; Yong Guo ; Yanqin Wang ; Jiawen Ren ; Dongsheng Qiao ; Xiaohui Liu ; Guanzhong Lu
• 关键词：Three-dimensional ; Navicular ; CeO₂ ; Lysozyme ; CO oxidation
• 刊名：Materials Chemistry and Physics
• 出版年：2010
• 出版时间：15 March 2010
• 年：2010
• 卷：120
• 期：1
• 页码：23-30
• 全文大小：1731 K

文摘

In this work, novel three-dimensional (3D) navicular ceria micro/nanocomposite architecture with multi-layered structure was synthesized for the first time via solution reaction followed by a simple hydrothermal treatment in the presence of lysozyme. During the synthesis procedure, a 3D navicular ceria precursor (Ce₂O(CO₃)₂·H₂O) with multi-layered structure was obtained after hydrothermal treatment at 100 °C for 10 h. Ceria with the same morphology can be obtained after thermal decomposition of this Ce₂O(CO₃)₂·H₂O precursor. Structural properties of the products were characterized by XRD, TG-DTA, FT-IR, SEM, TEM, and N₂-sorption techniques. Then a possible layer-by-layer electrostatic self-assembled growth mechanism was proposed for the formation of this 3D navicular architecture based on the experimental results and detail analysis of the evolution process of ceria precursors. Furthermore, a mold reaction of the catalytic oxidation of CO was conducted on the as-obtained CeO₂ and gold supported catalyst, both showed excellent activity and durability for CO conversion.