SusChEM: Chemical Dynamics of Polyatomic Molecules at Surfaces: New Insights from State-Selected Studies

SusChEM：表面多原子分子的化学动力学：国家选定研究的新见解

• 批准号: 1465230
• 负责人: Arthur Utz
• 金额: $ 53.46万
• 依托单位: Tufts University
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2015
• 资助国家: 美国
• 起止时间: 2015-08-15 至 2018-07-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1465230&HistoricalAwards=false
• 关键词: SusChEM; Chemical; Dynamics; Polyatomic; Molecules

In this award, funded by the Chemical Structure, Dynamics and Mechanisms (CSDM-A) Program of the Division of Chemistry, Professor Arthur Utz of Tufts University and his graduate and undergraduate student colleagues are studying the reactivity of molecules with vibrational excitation on catalytically-active metal surfaces. Scientists believe that metal-atom vibrations on some surfaces may significantly enhance the reactivity of molecules on the surface. Prof. Utz's research uses molecules with vibrational excitation to probe this effect on a variety of metal surfaces. The goal of research like this is to learn more about the way that gas-surface reactivity can be enhanced with catalytic metal surfaces. Studies like this could lead the way to improved catalysts for industrial processes. Students working in the Utz group receive training in ultrahigh vacuum methods as well as in the use of lasers and sophisticated optical systems. Prof. Utz and his group are also involved in educational outreach to underserved schools in Boston.Prof. Arthur Utz and his research group conduct detailed surface-molecule scattering experiments to probe the ways in which surface metal vibrations modulate catalytic reactivity on a variety of transition metal surfaces. Lasers are used to excite vibrations in molecules entrained in a molecular beam incident upon a variety of transition metal surfaces. Differences in reactivity are probed by monitoring the production of different products as a function of surface temperature and corrugation. Specific reactant gases to be studied include: water, ammonia, methanol, carbon dioxide, ethane and methane. Metals to be studied include: Ni, Pt, Cu and Ru. Questions to be asked include: (1) What are the factors (e.g. identity of dissociation fragments and/or metal surface, local surface structure, etc.) that result in significant modulation of reactivity, and how general is this effect? (2) Is the modulation of reactivity greater at under-coordinated atoms that may undergo larger amplitude motion at a given level of vibrational excitation? (3) Can surface temperature dependence of state-resolved reactivity measurements be used to ascertain details of reaction mechanisms (e.g. barrier height determination)? The Utz research group includes active involvement by undergraduates (Tufts University as well as Stonehill College) in authentic research. Educational outreach takes place with teachers at Josiah Quincy Upper School in Boston's Chinatown neighborhood, designing hands-on activities that complement curricular standards.

在该奖项的资助下，塔夫茨大学的 Arthur Utz 教授及其研究生和本科生同事正在化学系化学结构、动力学和机理 (CSDM-A) 项目的资助下，研究分子在催化活性金属表面上振动激发的反应性。 科学家认为，某些表面上的金属原子振动可能会显着增强表面分子的反应性。 乌茨教授的研究利用振动激发的分子来探测这种对各种金属表面的影响。 此类研究的目的是更多地了解如何通过催化金属表面增强气体表面反应性。 类似的研究可能会为改进工业过程的催化剂开辟道路。 在伍兹集团工作的学生接受超高真空方法以及激光和复杂光学系统使用的培训。 乌茨教授和他的团队还参与了对波士顿服务不足的学校的教育推广活动。 Arthur Utz 和他的研究小组进行了详细的表面分子散射实验，以探讨表面金属振动调节各种过渡金属表面催化反应性的方式。 激光用于激发入射到各种过渡金属表面的分子束中夹带的分子的振动。 通过监测不同产品的生产作为表面温度和波纹的函数来探究反应性的差异。 待研究的具体反应气体包括：水、氨、甲醇、二氧化碳、乙烷和甲烷。 要研究的金属包括：Ni、Pt、Cu 和 Ru。 要问的问题包括：（1）导致反应性显着调节的因素（例如解离碎片和/或金属表面的特性、局部表面结构等）是什么？这种效应的普遍性如何？ (2) 在给定的振动激发水平下可能经历更大幅度运动的欠配位原子的反应性调制是否更大？ (3) 状态分辨反应性测量的表面温度依赖性能否用于确定反应机制的细节（例如势垒高度的确定）？ 伍兹研究小组包括本科生（塔夫茨大学和斯通希尔学院）积极参与真实研究。 波士顿唐人街附近的乔赛亚·昆西高中的老师们进行了教育推广活动，设计了补充课程标准的实践活动。