Atomistic Studies of Reactions on Surfaces

在分析和表面化学项目的支持下，哈佛大学的Madex教授和他的同事们正在研究吸附在金属表面的物种的二维结构对表面反应性的影响。利用扫描隧道显微镜、光电子能谱、红外光谱和程序升温脱附等手段研究了表面改性剂和反应物的局部时空分布。讨论了三个特别的问题：金属原子与反应中间体结构的结合，银表面环氧化反应形成的表面结构，以及金属表面自催化反应的起源。这项工作提供了有关多相催化动力学的基本信息，这是一个具有巨大商业意义的过程。哈佛大学的马迪克斯教授和他的同事们正在研究表面空间组织对表面反应动力学和动力学的影响。利用显微镜和光谱方法，他们正在解决特定的问题，中间体形成，自催化，和环氧化机制的良好特征的表面。这些基本信息有力地增加了我们对多相催化过程的理解。

AbstractCHE-0513936Madix/HarvardWith the support of the Analytical and Surface Chemistry Program, Professor Madix and his coworkers at Harvard University are investigating the effects of the two dimensional organization of species adsorbed on metal surfaces on surface reactivity. Scanning tunneling microscopy, coupled with photoelectron spectroscopy, infrared, and temperature programmed desorption are used to examine the local spatial and temporal distribution of surface modifiers and reactants. Three particular issues are addressed; the incorporation of metal atoms in to the structure of reaction intermediates, the surface structures formed in epoxidation reactions on silver, and the origin of autocatalytic reactions on metal surfaces. This work provides fundamental information about the dynamics of heterogeneous catalysis, a process of immense commercial importance. Professor Madix and his coworkers at Harvard University are studying the effects of surface spatial organization on the kinetics and dynamics of surface reactions. Using microscopic and spectroscopic methods, they are addressing specific questions of intermediate formation, autocatalysis, and epoxidation mechanisms on well characterized surfaces. This fundamental information strongly adds to our understanding of heterogeneous catalytic processes.