Metal supported oxide nanostructures: model systems for advanced catalysis
Metal supported oxide nanostructures: model systems for advanced catalysis
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DOI：
10.1007/s11244-007-0324-6
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发表时间：
2007-09
影响因子：
3.6
通讯作者：
J. Schoiswohl;M. Sock;Q. Chen;G. Thornton;G. Kresse;M. Ramsey;S. Surnev;F. Netzer
中科院分区：
文献类型：
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作者：
J. Schoiswohl;M. Sock;Q. Chen;G. Thornton;G. Kresse;M. Ramsey;S. Surnev;F. Netzer
在“逆模型催化剂”概念的框架内讨论了金属支撑的氧化物纳米结构。我们发现，金属表面的氧化物纳米结构可以看作是人造氧化物材料，与块状氧化物化合物相比，它显示出新的性质，并通过界面相互作用和二维限制效应来稳定。这是以Rh(111)和Pd(111)表面上的氧化钒覆盖的典型例子为例。讨论了V-氧化物/Rh和V-氧化物/Pd逆相催化剂表面氧化相的结构和形态变化，讨论了催化剂体系在氧化还原循环中的传质问题。我们证明了氧化物团簇在金属表面的扩散提供了一种有效的质量输运方式。研究了金属-氧化物界面在决定特定衬底表面氧化物纳米层结构中的作用，认为界面化学和界面应变效应是重要的参数。
Metal supported oxide nanostructures are discussed within the framework of the “inverse model catalyst” concept. We show that oxide nanostructures on metal surfaces may be regarded as artificial oxide materials, which display novel properties as compared to bulk oxide compounds and are stabilised by interfacial interactions and two-dimensional confinement effects. This is illustrated for prototypical examples of vanadium oxide overlayers on Rh(111) and Pd(111) surfaces. Structure and morphological changes of the oxide phase on V-oxide/Rh and V-oxide/Pd inverse catalyst surfaces are discussed, and the mass transport problem in catalyst systems during oxidation-reduction cycles is addressed. We demonstrate that the diffusion of oxide cluster over the metal surface provides a effective means of mass transport. The role of metal-oxide interface in determining the oxide nanolayer structure on particular substrate surfaces is investigated, and interfacial chemistry and interfacial strain effects are identified as important parameters.