形貌控制的氧化物纳米粒子在多相催化中的应用
形貌控制的氧化物纳米粒子在多相催化中的应用
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DOI：
10.1002/asia.201600115
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发表时间：
2016
期刊：
影响因子：
--
通讯作者：
Wenjie Shen
中科院分区：
文献类型：
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作者：
Yan Zhou;Yong Li;Wenjie Shen
在纳米尺度上制备尺寸和形状可调的氧化物颗粒是设计和开发高效多相催化剂的关键问题之一。氧化物纳米颗粒的形状对其催化性能有显著影响。调整氧化物颗粒的形状允许优先暴露特定的反应性小面;这可以使反应物可用的活性位点的数量最大化，这可以提高活性，并且还将反应路线介导到特定的通道，以实现对特定化学反应的更高选择性。此外，氧化物颗粒的形状影响它们与金属颗粒或团簇的相互作用，这涉及界面应变和电荷转移。分散在氧化物载体的反应性或极性面上的金属颗粒或簇通常提供上级催化性能，这主要是因为强的金属-载体相互作用。然而，金属氧化物界面的几何和电子特征可能在反应过程中发生变化，这是由反应分子在高温下的化学吸附引起的，在提出结构-反应性关系时应考虑到这一点。
The fabrication of oxide particles with tunable sizes and shapes at the nanoscale is one of the most crucial issues for the design and development of highly efficient heterogeneous catalysts. The shape of oxide nanoparticles has been demonstrated to affect their catalytic properties remarkably. Tuning the shape of oxide particles allows preferential exposure of specific reactive facets; this can maximize the number of active sites available to the reactants, which can improve the activity and also mediate the reaction route to a specific channel to achieve higher selectivity for a particular chemical reaction. In addition, the shape of the oxide particles affects their interaction with metal particles or clusters, and this involves interfacial strain and charge transfer. Metal particles or clusters dispersed on the reactive or polar facets of the oxide support often provide superior catalytic performance, primarily because of strong metal–support interactions. However, the geometric and electronic features of the metal‐oxide interface may change during the course of the reaction, induced by chemisorption of reactive molecules at elevated temperatures, which should be taken into account in proposing a structure–reactivity relationship.