Mimicking Aspects of Heterogeneous Catalysis

9318625 Bent为了了解催化反应是如何发生的，重要的是要识别和研究可能存在于催化条件下的反应过程中的表面上的可能的反应中间体。 该研究项目由分析和表面化学计划支持，旨在确定与多相催化相关的反应的中间体和反应途径。 反应中间体将产生和特征在于铜和金表面在低温下通过分子前体的分解和原子氢与不饱和分子吸附物的反应。 本工作将集中在烯丙基，甲酰基和乙烯基物种作为催化裂化和部分氧化催化的中间体。 该项目的第二部分将解决卤化碳分子在这些相同的过渡金属表面上的活化吸附的问题。 振动光谱和近边X射线吸收精细结构光谱将是用于这些模型研究的主要工具。 高效和无污染的催化化学过程的设计依赖于过渡金属催化表面反应机理的知识。 获得这种机理信息的一种方法是建立表面上可能的反应中间体的化学特性和反应性。 该研究项目通过制备可能的反应中间体，在表面上表征它们并探索它们的化学性质来解决催化化学的这一方面。 这项工作的结果将有助于了解重要的催化过程。 ***

9318625 Bent In order to understand how catalytic reactions take place, it is important to identify and study possible reaction intermediates which might exist on the surface during a reaction under catalytic conditions. This research project, supported by the Analytical and Surface Chemistry Program, is designed to identify intermediates and reaction pathways for reactions relevant to heterogeneous catalysis. Reaction intermediates will be generated and characterized on copper and gold surfaces at low temperature by the decomposition of molecular precursors and by the reaction of atomic hydrogen with unsaturated molecular adsorbates. This work will concentrate on allyl, formyl and vinyl species as intermediates in catalytic cracking and partial oxidation catalysis. The second part of this project will address the question of activated adsorption of halocarbon molecules on these same transition metal surfaces. Vibrational spectroscopy and near edge X-ray absorption fine structure spectroscopy will be the primary tools used for these model studies. %%% The design of efficient and non-polluting catalytic chemical processes relies on a knowledge of the mechanisms of the transition metal catalyzed surface reaction. One approach to obtaining this mechanistic information is to establish the chemical identity and reactivity of possible reaction intermediates on the surface. This research project addresses this aspect of catalytic chemistry by preparing possible reaction intermediates, characterizing them on the surface, and exploring their chemistry. The results of this work will help to develop an understanding of important catalytic processes. ***