Microscopic Surface Transport Phenomena

微观表面传输现象

• 批准号: 9303062
• 负责人: Janice Reutt-Robey
• 金额: $ 36.42万
• 依托单位: University of Maryland, College Park
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 1993
• 资助国家: 美国
• 起止时间: 1993-07-01 至 1998-05-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9303062&HistoricalAwards=false
• 关键词: Microscopic; Surface; Transport; Phenomena

The diffusion of molecular species on solid surfaces is an important step in most heterogeneous reaction mechanisms. The detailed investigation of surface diffusion is the subject of this research project supported by the Analytical and Surface Chemistry Program. A pulsed molecular beam-surface infrared spectrometer system has been constructed to investigate the transport of CO, NO, and substituted isonitriles on stepped palladium and nickel surfaces. Step and terrace populations will be characterized, low and high coverage diffusion measurements made, and transient mobility studies carried out during the course of this project. This work will provide a very comprehensive picture of molecular transport on well characterized surfaces. %%% The transport of molecules across surfaces is an important step in reactions which are mediated by these surfaces. In order to develop a detailed understanding of surface reactions such as corrosion and catalysis, information about the mechanism and rate of surface diffusion must be obtained. This research project combines molecular beam dosing methods with surface infrared spectroscopy to directly measure the diffusion of small molecules on catalytically important surfaces.

在大多数非均相反应机制中，分子在固体表面的扩散是一个重要步骤。表面扩散的详细研究是本研究项目的主题，由分析和表面化学计划支持。建立了脉冲分子束-表面红外光谱仪系统，研究了CO、NO和取代异腈在阶梯钯和镍表面的输运。在这个项目的过程中，将对台阶和阶地种群进行特征描述，进行低覆盖率和高覆盖率扩散测量，并进行瞬态迁移研究。这项工作将提供一个非常全面的画面分子运输的表征良好的表面。分子在表面上的转运是由这些表面介导的反应的重要步骤。为了详细了解表面反应，如腐蚀和催化反应，必须获得有关表面扩散机理和速率的信息。本研究项目将分子束给药方法与表面红外光谱相结合，直接测量小分子在催化重要表面上的扩散。