Characterization of the Thermal Chemistry of Hydrogen Intermediates on Transition Metal Surfaces

这项研究项目得到了分析和表面化学计划的支持，探索了过渡金属表面碳氢化合物物种的详细动力学。这项工作的重点是开发利用低能离子源在表面清洁地制备烃类中间体的方法，提高在这些系统中监测表面动力学的灵敏度，并对这些被吸附的中间体的反应进行仔细的等温动力学测量。要探索的化学包括中间体的分离和反应，如烷基、乙烯基和烯丙基在铂、铜和镍表面。%了解碳氢化合物分子与过渡金属表面相互作用时产生的中间体的详细化学对于理解多相催化非常重要。这项研究项目开发了识别和详细描述吸附在铂、镍和铜等重要催化金属上的碳氢化合物中间体的动力学的方法和途径。从这些研究中获得的动力学信息将有助于我们进一步了解过渡金属催化剂的反应活性和选择性。

This research project, supported in the Analytical and Surface Chemistry Program, explores the detailed kinetics of hydrocarbon species on well characterized transition metal surfaces. The work focusses on the development of methods for preparing hydrocarbon intermediates cleanly on the surface using a low energy ion source, on improving the sensitivity for monitoring surface kinetics in these systems, and on carrying out careful isothermal kinetic measurements of the reactions of these adsorbed intermediates. The chemistry to be explored includes the isolation and reaction of intermediates such as alklyidene, vinyl, and allyl on platinum, copper and nickel surfaces. %%% The understanding of the detailed chemistry of the intermediates produced when hydrocarbon molecules interact with transition metal surfaces is important for understanding heterogeneous catalysis. This research project develops methods and approaches for identifying and detailing the kinetics of adsorbed hydrocarbon intermediates on such catalytically important metals as platinum, nickel and copper. The kinetic information obtained from these studies will be useful for our developing understanding of the reactivity and selectivity of transition metal catalysts.