CeO2 hollow nanospheres synthesized by a one pot template-free hydrothermal method and their application as catalyst support†,RSC Advances

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CeO2 hollow nanospheres synthesized by a one pot template-free hydrothermal method and their application as catalyst support†
RSC Advances ( IF 3.9 ) Pub Date : 2015-06-29 00:00:00 , DOI: 10.1039/c5ra08124f
Yuanmei Xu _{1,

2,

3,

4} , Yiwei Zhang _{1,

2,

3,

4} , Yuming Zhou _{1,

2,

3,

4} , Sanming Xiang _{1,

2,

3,

4} , Qianli Wang _{1,

2,

3,

4} , Chao Zhang _{1,

2,

3,

4} , Xiaoli Sheng _{1,

2,

3,

4}

Affiliation

Uniform ceria hollow nanospheres composed of ceria nanocrystals have been synthesized via a simple one-step hydrothermal method without using any template. Afterwards, these hollow materials were used as support to prepare the Au/CeO₂ catalyst for the reduction of 4-nitrophenol (4-NP). It was found that the obtained porous CeO₂ hollow nanospheres were morphologically uniform, with an average diameter of 210 nm and high specific surface area of 167 m² g⁻¹. According to the basis of a time-dependent experiment, a self-assembly process coupled with an Ostwald ripening mechanism was proposed to explain the evolution of CeO₂ hollow nanospheres. In comparison with the commercial CeO₂ powder supported sample, the synthesized hollow Au/CeO₂ nanospheres catalyst exhibited significantly enhanced catalytic activity. In addition, the results of cyclic stability of the catalyst indicated that similar catalytic performance without visible reduction could be found after 7 repeated cycles. As for this catalyst system, the unique porosity structures of the support, uniform distribution of metallic particles together with the high thermal stability of Au NPs were all responsible for the improved reaction properties.

中文翻译：

一锅无模板水热法合成 CeO ₂空心纳米球及其在催化剂载体中的应用†

由氧化铈纳米晶体组成的均匀的氧化铈空心纳米球已通过简单的一步水热法合成，无需使用任何模板。然后，将这些中空材料用作载体以制备用于还原4-硝基苯酚（4-NP）的Au / CeO ₂催化剂。发现所获得的多孔CeO ₂中空纳米球在形态上是均匀的，平均直径为210nm并且高比表面积为167m ² g ^-1。根据随时间变化的实验，提出了一种自组装过程和奥斯特瓦尔德（Ostwald）成熟机制，以解释CeO ₂空心纳米球的演化。与商用CeO相比_在2种粉末负载的样品中，合成的中空Au / CeO₂纳米球催化剂表现出显着增强的催化活性。另外，催化剂的循环稳定性的结果表明，在7个重复循环之后，可以发现相似的催化性能而没有可见的还原。对于该催化剂体系，载体独特的孔隙结构，金属颗粒的均匀分布以及Au NPs的高热稳定性都是改善反应性能的原因。

更新日期：2015-06-29

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