Single Crystal Adsorption Microcalorimetry

9319234坎贝尔关于吸附过程的准确热力学信息对于发展表面反应的机械理解是必不可少的。 这方面的信息是不可用的，在大多数情况下，吸附活性分子物种的良好表征固体表面。 这个研究项目，在分析和表面化学计划的支持下，旨在获得这类信息的催化重要系统的数量。 这些信息将通过在超高真空条件下对特征良好的薄金属和金属氧化物单晶样品进行仔细的微量热测量来获得。 这项工作将强调那些不能用更传统的方法，如热脱附光谱学研究的系统。 将获得有关吸附键强度的详细信息，以及表面结构和组成对这些热力学性质的影响。 为了开发和探测这些技术上重要的过程的反应机理，需要对吸附分子和催化表面之间的结合强度有基本的了解。 本研究项目旨在开发和应用一种技术，用于直接测量这种吸附强度的良好表征的催化表面。 所获得的热力学信息将是非常有用的，用于评估可能的表面反应机制和发展的催化重要过程的基本理解。 ***

9319234 Campbell Accurate thermodynamic information about adsorption processes is essential to developing a mechanistic understanding of surface reactions. This information is not available, for the most part, for adsorption of reactive molecular species on well characterized solid surfaces. This research project, supported in the Analytical and Suface Chemistry Program, is designed to obtain this sort of information for a number of catalytically important systems. This information will be obtained by careful microcalorimetry measurements on well characterized thin metal and metal oxide single crystal specimens under ultra high vacuum conditions. The work will emphasize systems which can not be studied by more traditional methods such as thermal desorption spectroscopy. Detailed information about adsorption bond strengths, and the effect of surface structure and composition on these thermodynamic properties will be obtained. %%% A basic understanding of the strength of bonding between an adsorbed molecule and a catalytic surface is needed in order to develop and probe reaction mechanisms for these technologically important processes. This research project is designed to develop and apply a technique for the direct measurement of this adsorption strength on well characterized catalytic surfaces. The thermodynamic information obtained will be very useful for evaluating possible surface reaction mechanisms and developing a basic understanding of catalytically important processes. ***