Mysliveček Josef, Matolín Vladimir, Matolínová Iva
Department of Surface and Plasma Science, Charles University in Prague, V Holešovičkách 2, 18000 Prague 8, Czech Republic.
Materials (Basel). 2015 Sep 18;8(9):6346-6359. doi: 10.3390/ma8095307.
An important part of fundamental research in catalysis is based on theoretical and modeling foundations which are closely connected with studies of single-crystalline catalyst surfaces. These so-called model catalysts are often prepared in the form of epitaxial thin films, and characterized using advanced material characterization techniques. This concept provides the fundamental understanding and the knowledge base needed to tailor the design of new heterogeneous catalysts with improved catalytic properties. The present contribution is devoted to development of a model catalyst system of CeO₂ (ceria) on the Cu(111) substrate. We propose ways to experimentally characterize and control important parameters of the model catalyst-the coverage of the ceria layer, the influence of the Cu substrate, and the density of surface defects on ceria, particularly the density of step edges and the density and the ordering of the oxygen vacancies. The large spectrum of controlled parameters makes ceria on Cu(111) an interesting alternative to a more common model system ceria on Ru(0001) that has served numerous catalysis studies, mainly as a support for metal clusters.
催化基础研究的一个重要部分基于理论和建模基础，这些基础与单晶催化剂表面的研究紧密相连。这些所谓的模型催化剂通常以外延薄膜的形式制备，并使用先进的材料表征技术进行表征。这一概念为定制具有改进催化性能的新型多相催化剂设计提供了基本理解和知识库。本论文致力于开发一种在Cu(111)衬底上的CeO₂（二氧化铈）模型催化剂体系。我们提出了实验表征和控制模型催化剂重要参数的方法——二氧化铈层的覆盖率、铜衬底的影响以及二氧化铈表面缺陷的密度，特别是台阶边缘的密度以及氧空位的密度和有序性。大量可控制的参数使得Cu(111)上的二氧化铈成为一种有趣的替代物，相较于更为常见的用于众多催化研究的Ru(0001)上的二氧化铈模型体系，后者主要作为金属簇的载体。
