Shape-Selective Oriented Cerium Oxide Nanocrystals Permit Assessment of the Effect of the Exposed Facets on Catalytic Activity and Oxygen Storage Capacity
Shape-Selective Oriented Cerium Oxide Nanocrystals Permit Assessment of the Effect of the Exposed Facets on Catalytic Activity and Oxygen Storage Capacity
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DOI：
10.1021/acsami.5b00298
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发表时间：
2015-04-29
影响因子：
9.5
通讯作者：
Ghosh, Swapankumar
中科院分区：
文献类型：
--
作者：
Sreeremya, Thadathil S.;Krishnan, Asha;Ghosh, Swapankumar
一系列的纳米晶CeO 2样品，制备有不同的形态，催化性能进行了测量，使用两个公认的指标;储氧和柴油机烟灰燃烧。用HR-TEM、XRD、XPS和拉曼等方法对粉体进行了表征。研究表明，活性是由活性晶面的相对分数，而不是由粉末的比表面积。物理研究是对不同方面活动的相对贡献进行定量评估的一步。该合成方案允许制造具有优先生长活性平面的CeO 2纳米结构，因此在开发催化应用和纳米复合方面具有潜力。
The catalytic performance of a range of nanocrystalline CeO2 samples, prepared to have different morphologies, was measured using two accepted indicators; oxygen storage and diesel soot combustion. The same powders were characterized hi detail by HR-TEM, XRD, XPS, and Raman methods. The study demonstrates that activity is determined by the relative fraction of the active crystallographic planes, not by the specific surface area of the powders. The physical study is a step toward quantitative evaluation of the relative contribution to activity of the different facets. The synthetic protocol permits fabrication of CeO2 nanostructures with preferentially grown active planes, and therefore has potential in developing catalytic applications and in nanocompositing.