Kinetics and Mechanisms of Surface Reactions by Laser-Induced Desorption with Fourier Transform Mass Spectrometry

在分析和表面化学项目的支持下，激光诱导热解吸与傅立叶变换质谱联用作为表面反应动力学的探针。加州大学欧文分校的John Hemminger教授和他的同事们正在使用这种方法来解决碳氢化合物表面反应动力学和机理的问题。特别是探讨了高浓度共吸附氢气对环己烷在铂(111)上脱氢反应初始C-H键断裂步骤的影响。此外，正在获得关于反应物覆盖层构型和铂表面碳氢反应中的系综效应的信息。这些基本信息为重要的多相催化反应提供了机理上的理解。在这个项目中，使用反应中间体的解吸，然后是这些物种的质谱学鉴定，以发展对表面反应机理的理解。碳氢化合物在具有良好特性的铂表面上的重要反应是这项工作的重点，它提供了对化学和能源生产行业核心的催化反应的基本理解。首席调查员实验室的独特实验能力使我们能够详细描述这些重要反应的机理和速率。

Laser induced thermal desorption coupled with Fourier transform mass spectrometry is used as a probe of surface reaction kinetics in this project carried out with support from the Analytical and Surface Chemistry Program. Professor John Hemminger of the University of California, Irvine and his coworkers are using this method to address questions of hydrocarbon surface reaction kinetics and mechanisms. In particular, the effect of high concentrations of coadsorbed hydrogen on the initial C-H bond breaking step in the dehydrogenation of cyclohexane on Pt(111) is being explored. In addition, information about reactant overlayer configuration, and ensemble effects in hydrocarbon reactions on the platinum surface, is being obtained. This fundamental information provides a mechanistic understanding for important heterogeneous catalytic reactions. Desorption of reaction intermediates, followed by mass spectral identification of these species, is used to develop an understanding of surface reaction mechanisms in this project. The important reactions of hydrocarbons on well characterized platinum surfaces are the focus of this work, which provides fundamental understanding of catalytic reactions central to the chemical and energy production industries. The unique experimental capability in the Principal Investigator's laboratory allows a detailed description of the mechanisms and rates of these important reactions.