Kinetics of Surface Reactions Studied by Laser-Induced Thermal Desorption with Fourier Transform Mass Spectrometry

9313169 Heminger在这项由分析和表面化学计划支持的研究项目中，将研究在具有良好特性的固体表面上进行的反应动力学。支持的研究将集中在过渡金属表面上碳氢化合物反应的详细机理和动力学。这些动力学研究将使用海明格教授开发的激光诱导热解吸傅里叶变换质谱仪(LITD/FTMS)技术进行。这项工作的目的是应用这种LITD/FTMS方法来研究吸附组态对反应速率的影响，并识别和量化氢气共吸附对烃类反应机理和动力学的影响。此外，还将研究有机金属在过渡金属表面上的吸附分解动力学，作为在这些表面合成活性中间体的可能途径。了解过渡金属表面上烃类反应的详细机理和动力学，对于理解多相催化是很重要的。该项目支持的研究将提供所需的机理和动力学细节，以帮助理解催化系统中的反应性和选择性问题。一种非常灵敏的仪器技术，激光诱导热解吸与傅立叶变换质谱学相结合，将被用来获得这一基本信息。对这些过渡金属催化反应的理解将有助于设计更节能、更环保的过程化学。***

9313169 Hemminger In this research project, supported in the Analytical and Surface Chemistry Program, the kinetics of reactions carried out on well characterized solid surfaces will be examined. The research supported here will concentrate on the detailed mechanisms and kinetics of hydrocarbon reactions on transition metal surfaces. These kinetic studies will be carried out using a technique developed by Professor Hemminger known as laser induced thermal desorption Fourier transform mass spectrometry (LITD/FTMS). The goal of this work is to apply this LITD/FTMS method to the study of the effect of adsorbate ensemble configurations on reaction rates, and to identify and quantify the effects of hydrogen coadsorption on the mechanisms and kinetics of hydrocarbon reactions. Additional work will address the kinetics of organometallic adsorbate decomposition on transition metal surfaces as a possible route to the synthesis of reactive intermediates on these surfaces. %%% An understanding of the detailed mechanisms and kinetics of hydrocarbon reactions on well characterized tranisition metal surfaces is important for developing an understanding of heterogeneous catalysis. The research supported in this project will provide the mechanistic and kinetic details needed to help understand issues of reactivity and selectivity in catalytic systems. A very sensitive instrumental technique, laser induced thermal desorption coupled with Fourier transform mass spectrometry, will be used to obtain this basic information. An understanding of these transition metal catalyzed reactions will help to design more energy efficient and more environmentally sensitive process chemistry. ***