Atomic Level Control and Probing of Chemical Reactions at Surfaces

在分析和表面化学计划和多学科活动办公室的支持下，在这个研究项目中进行了原子水平上的结构和反应性的研究。 Koel教授和他在南加州大学的同事开发了超高真空扫描隧道显微镜仪器，该仪器允许识别金属表面上的吸附位点和分子吸附物。 模型的反应性之间的相关性的表面和原子级结构和占领的步骤和缺陷的网站在这些表面上。 Pt-Sn合金表面和难熔金属基底上的Pd薄膜正在被检查，并且正在探测这些表面上的各种烃反应，包括乙炔三聚形成苯。 从这些研究中获得的见解将有助于我们了解重要的催化过程。 在这个研究项目中，我们正在研究表面的原子级结构与这些表面的反应化学之间的关系。 碳氢化合物的反应有关的多相催化研究的良好特征的Pt-Sn和Pd-Mo基板上，为了探测这些表面上的金属原子系综和缺陷位点的效果。 使用扫描探针显微镜的原子水平表征形成了这些研究的基础，这将提供重要的催化系统的操作洞察。

Atomic level studies of structure and reactivity of bimetallic surfaces are carried out in this research project supported by the Analytical and Surface Chemistry Program and the Office of Multidisciplinary Activities. Professor Koel and his coworkers at the University of Southern California have developed ultra high vacuum scanning tunneling microscope instrumentation which allows the identification of adsorption sites and molecular adsorbates on metallic surfaces. Correlations between reactivity of model bimetallic surfaces and the atomic level structure and occupation of step and defect sites on these surfaces will be made. Pt-Sn alloy surfaces, and Pd thin films on refractory metal substrates are being examined, and various hydrocarbon reactions on these surfaces, including acetylene trimerization to form benzene, are being probed. Insights gained from these studies will be valuable in developing our understanding of important catalytic processes. Correlations between atomic level structure of bimetallic surfaces and the reaction chemistry of these surfaces are being made in this research project. Hydrocarbon reactions relevant to heterogeneous catalysis are examined on well characterized Pt-Sn and Pd-Mo substrates, in order to probe the effect of metal atom ensembles and defect sites on these surfaces. Atomic level characterization using scanning probe microscopy forms the basis of these studies which will provide insight into the operation of important catalytic systems.