Imaging Molecules and Chemical Reactions by Scanning Tunneling Microscopy

在分析和表面化学项目的支持下，江教授和她在加州大学戴维斯分校的同事们正在进行重要模型催化系统的微观机制的研究。 杂环分子的分解、乙炔环化成苯和环己烯脱氢是研究的模型体系。 在这些研究中使用的扫描探针显微镜允许真实的空间成像的这些反应过程的良好特征的钯或铂表面。 表面物种的反应性与这些表面上的缺陷，步骤和共吸附物的存在相关。 比较吸附物种的图像与理论预测的图像是用来识别吸附物种。了解多相催化反应的细节有助于催化过程化学的设计和优化。 加州大学戴维斯分校的蒋教授正在使用分子分辨率扫描探针显微镜方法来检查真实的空间中模型催化反应的细节。 被吸附物质的反应性与这些模型表面上缺陷、台阶和共吸附物的存在相关。 从这些研究中获得的信息将是有用的，在炼油原料的脱硫和脱氮化学的优化。

With the support of the Analytical and Surface Chemistry Program, Professor Chiang and her colleagues at the University of California-Davis are carrying out studies of the microscopic mechanisms of important model catalytic systems. The decomposition of heterocyclic molecules, the cyclization of acetylene to benzene, and the dehydrogenation of cyclohexene are the model systems being investigated. The use of scanning probe microscopy in these studies allows real space imaging of these reaction processes on the well-characterized palladium or platinum surface. Surface species reactivity is correlated with the presence of defects, steps, and co-adsorbates on these surfaces. Comparison of adsorbed species images with theoretically predicted images is used to identify the adsorbed species. An understanding of the details of heterogeneous catalytic reactions is useful for the design and optimization of catalytic process chemistry. Professor Chiang at UC-Davis is using molecular resolution scanning probe microscopic methods to examine the details of model catalytic reactions in real space. Adsorbed species reactivity is being correlated with the presence of defects, steps, and co-adsorbates on these model surfaces. Information obtained from these studies will be useful in the optimization of sulfur and nitrogen removal chemistry in refining petroleum feedstocks.