Structure and Reactivity of Pd Monolayers and Ultrathin Films

9321768 Koel：研究难熔金属衬底上薄Pd覆盖层的结构和反应性是本项目支持的研究重点。通过结合离子散射、扫描隧道显微镜和热脱附光谱的动力学研究，探索Pd的表面反应性和体反应性之间的差异。这项由分析和表面化学计划支持的研究结果将影响我们对双金属催化系统的理解。化学吸附和反应性质将与光谱测量的几何和电子效应相关联。具有催化活性的过渡金属和不活泼的底物之间的相互作用是广泛使用的双金属催化剂体系的基础。本研究项目探讨控制催化化学的双金属体系中的几何和电子效应。这类研究提供的信息为多相催化材料的设计和操作提供了知识基础。＊＊＊

9321768 Koel Studies of the structure and reactivity of thin Pd overlayers on refractory metal substrates forms the focus of the research supported in this project. By combining ion scattering, scanning tunneling microscopy, and kinetic studies using thermal desorption spectroscopy, the differences between surface and bulk reactivity of Pd will be probed. The results of this investigation, supported by the Analytical and Surface Chemistry Program, will impact on our understanding of bimetallic catalytic systems. Chemisorption and reaction properties will be correlated with geometric and electronic effects measured spectroscopically. %%% The interaction between a catalytically active transition metal and an unreactive substrate underlies widely used bimetallic catalyst systems. This research project probes the geometric and electronic effects in bimetallic systems which control the catalytic chemistry. Information from studies of this sort provide the knowledge base for the design and manipulation of heterogeneous catalytic materials. ***