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

该项目得到了分析和表面化学项目的支持，重点是制备一系列混合过渡金属氧化物（TMO）表面，并表征其组成，氧化还原状态及其气体吸收特性。 TMO在自然界中普遍存在，它们的气体吸附性能与一系列多相催化反应有关。 在这三年的持续资助，教授马乔里A。Langell和她在内布拉斯加大学的学生将在表征良好的单晶衬底和岩盐、尖晶石和尖晶石的晶体外延上制备TMO。 将通过高分辨率电子能量损失谱（HREELS）、X射线光电子能谱（XPS）、低能电子衍射（利兹）、热解吸质谱（TDMS）和俄歇电子能谱来研究衬底-气体相互作用。 这项工作将有助于了解重要的酸碱依赖的催化过程中发生在TMO表面。 被吸附的气体分子在过渡金属氧化物的表面经历催化反应。 这些反应在自然界中普遍存在。 Marjorie A. Langell和她在内布拉斯加大学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是在这些催化表面上的醇和有机酸的反应和广泛的表面敏感的仪器方法将在这项工作中使用。

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.