Surface and redox characterization of new nanostructured ZrO2@CeO2 systems with potential catalytic applications
Surface and redox characterization of new nanostructured ZrO2@CeO2 systems with potential catalytic applications
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DOI：
10.1002/sia.6444
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发表时间：
2018-11-01
影响因子：
1.7
通讯作者：
Juan Calvino, Jose
中科院分区：
文献类型：
--
作者：
Barroso-Bogeat, Adrian;Nunez-Perez, Bernardo;Juan Calvino, Jose
氧化铈-氧化锆复合氧化物被广泛用作催化剂和催化剂载体。然而，由于经济和地缘战略的考虑，在保持甚至改善其优异的氧化还原和催化性能的同时，减少和优化这些配方中的稀土元素含量已经成为当前研究的一个挑战。在此背景下，核壳纳米结构的设计作为实现上述目标的可行替代方案应运而生。本文采用一种新的合成方法，通过两个不同的步骤制备了一种新的纳米结构：(1)用溶胶-凝胶法合成氧化锆芯；(2)用控制化学沉淀法在氧化锆核表面包覆一层薄的氧化铈。所得到的纳米复合材料通过多种技术进行了表征，与纯CeO2相比，清楚地揭示了其完美的核@壳纳米结构和增强的还原能力。
Ceria-zirconia mixed oxides are widely used as catalysts and catalytic supports. Nevertheless, due to economic and geo-strategic concerns, reducing and optimizing the lanthanide content in these formulations while preserving or even improving their excellent redox and catalytic properties has become a challenge for current research. In this context, the design of core@shell nanostructures arises as a feasible alternative to achieve the aforesaid goal. In the present work, a new nanostructured ZrO2@CeO2 system based on spherical and mesoporous zirconia cores coated by a well-dispersed nanometer-thick ceria layer has been prepared by a novel synthetic approach in 2 different steps: (1) synthesis of the zirconia cores by a sol-gel method and (2) coating with a thin ceria shell by controlled chemical precipitation. The resulting nanocomposite was characterized by several techniques, which clearly reveal its perfect core@shell nanostructure and enhanced reducibility as compared with pure ceria.