Adsorbate Photochemical Dynamics and Catalysis

吸附质光化学动力学和催化

• 批准号: 0078995
• 负责人: Ian Harrison
• 金额: $ 38.2万
• 依托单位: University of Virginia Main Campus
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2000
• 资助国家: 美国
• 起止时间: 2000-08-01 至 2003-07-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0078995&HistoricalAwards=false
• 关键词: Adsorbate; Photochemical; Dynamics; Catalysis

This research project addresses the detailed dynamics of photoinduced reactions at well-characterized solid surfaces. Using angle resolved time-of-flight measurements, Professor Ian Harrison and his students at the University of Virginia are exploring the photoactivation of adsorbates such as N2, CO2, and methane. With the support of the Analytical and Surface Chemistry Program this work provides detailed insight into the mechanisms of small molecule activation at surfaces, with strong implications for the development and improvement of heterogeneous catalytic methods. Charge transfer excitation of these adsorbed molecules followed by analysis of the desorbed products, allows this group to probe the details of the transition state for photostimulated as well as thermally stimulated surface reactions. The photoexcitation of adsorbed molecules can be used to probe the dynamics of more common thermally activated processes on surfaces. This research project uses fast laser excitation of adsorbates, followed by angle resolved measurements of product velocities to provide information about the detailed dynamics of several important small molecule reactions on well-characterized surfaces. The results of these photodynamic studies are then applied to the understanding of the mechanisms of thermally activated catalytic reactions of considerable importance.

这项研究项目研究了在具有良好特性的固体表面上光诱导反应的详细动力学。利用角度分辨飞行时间测量，弗吉尼亚大学的伊恩·哈里森教授和他的学生正在探索氮气、二氧化碳和甲烷等吸附物的光活化。在分析和表面化学计划的支持下，这项工作对小分子在表面活化的机理提供了详细的见解，对多相催化方法的发展和改进具有重要的意义。这些吸附分子的电荷转移激发，然后分析解吸产物，使这个小组能够探索光刺激和热刺激表面反应的过渡态的细节。吸附分子的光激发可以用来探测表面上更常见的热激活过程的动力学。该研究项目使用快速激光激发吸附物质，然后对产物速度进行角度分辨测量，以提供有关几个重要的小分子反应在特征良好的表面上的详细动力学信息。然后，这些光动力学研究的结果被应用于理解具有相当重要意义的热激活催化反应的机理。