Transition Metal Oxide-Adsorbate Interactions by HREELS, TDSand Photoelectron Spectroscopies

该项目在分析和表面化学计划的支持下，专注于一系列混合过渡金属氧化物(TMO)表面的制备，以及它们的组成、氧化还原状态和气体吸收性能的表征。TMO在自然界中普遍存在，其对气体的吸附性能与一系列多相催化反应有关。在这项为期三年的持续资助中，内布拉斯加大学的Marjorie A.Langell教授和她的学生将在具有良好特性的单晶衬底和岩盐、尖晶石和刚玉的结晶外延上制备TMO。用高分辨电子能量损失谱(HREELS)、X射线光电子能谱(XPS)、低能电子衍射(LEDS)、热脱附质谱(TDMS)和俄歇电子能谱(俄歇电子能谱)研究衬底与气体的相互作用。这项工作将有助于理解发生在TMO表面的重要的酸碱依赖的催化过程。吸附的气体分子在过渡金属氧化物表面发生催化反应。这些反应在自然界中无处不在。内布拉斯加州大学的Marjorie A.Langell教授和她的学生将在受控条件下研究这些反应，以更好地理解这些重要的化学反应。这项工作的化学重点将放在醇和有机酸在这些催化表面上的反应上，并将使用广泛的表面敏感仪器方法。

This project, supported in the Analytical and Surface Chemistry Program, focusses on the preparation of a series of mixed transition metal oxide (TMO) surfaces and the characterization of their composition, redox states, and their gas absorption properties. TMOs are ubiquitous in nature and their gas adsorption properties are relevant to a range of heterogeneous catalytic reactions. During this three year continuing grant, Professor Marjorie A. Langell and her students at the University of Nebraska will prepare TMOs on well characterized single crystal substrates and crystalline epitaxies of rocksalt, spinel and corundum. Substrate-gas interactions will be studied by high resolution electron energy loss spectroscopy (HREELS), x-ray photoemission spectroscopy (XPS), low energy electron diffraction (LEEDS), thermal desorption mass spectrometry (TDMS), and Auger electron spectroscopy. This work will contribute to the understanding of important acid-base dependent catalytic processes that occur at TMO surfaces. Adsorbed gas molecules undergo catalytic reactions at the surfaces of transition metal oxides. These reactions are ubiquitous in nature. Professor Marjorie A. Langell and her students at the University of Nebraska will study these reactions under controlled conditions to better understand these important chemical reactions. The chemical focus of this work will be on the reactions of alcohols and organic acids on these catalytic surfaces and a broad range of surface sensitive instrumental methods will be used in this work.