Adsorption and Reaction Sites on Supported Metal Catalysts

该项目的目标是确定和 表征氢化反应的活性位点， 负载型金属催化剂，并确定依赖于 活性中心的浓度和活性 催化剂的物理性质。 这涉及 确定氧化物载体上是否发生氢化， 在金属上的位点和在金属上的位点之间的转移速率， 氧化物，过程中的限制步骤是什么，以及如何 这些因素取决于制备的性质和方式 的催化剂。 程序升温反应， 程序升温解吸，同位素标记， 瞬态同位素训练，和红外光谱法使用 研究负载铂上的多个反应位点， 钯催化剂 待氢化的底物包括 吸附甲氧基和吸附有机物。 一系列催化剂 使用的催化剂的特征在于： 氢化学吸附，表面积测量，X射线 光电子光谱和原子吸收。 本项目研究氢化的基本方面 在类似于工业中使用的系统中的反应。 虽然这项研究并不针对任何特定的 应用，它可能会导致工业的改善 在许多情况下氢化。 这些过程在以下方面很常见： 特种化学品、制药、食品加工，以及 石油工业。

The objectives of this project are to identify and characterize the active sites for hydrogenation reactions on supported metal catalysts and to determine the dependence of the concentration and activity of the active sites on the physical properties of the catalyst. This involves determining whether hydrogenation occurs on the oxide support, the rates of transfer between sites on the metal and on the oxide, what the limiting steps in the process are, and how these factors depend on the properties and mode of preparation of the catalysts. Temperature-programmed reaction, temperature-programmed desorption, isotopic labelling, transient isotope training, and infrared spectroscopy are used to study multiple reaction sites on supported platinum and palladium catalysts. Substrates to be hydrogenated include adsorbed methoxy and adsorbed organics. A series of catalyst preparations is used, with the catalysts characterized by hydrogen chemisorption, surface-area measurements, X-ray photoelectron spectroscopy, and atomic absorption. This project examines fundamental aspects of hydrogenation reactions in systems similar to those used in industry. Although the study is not directed to any particular application, it could lead to improvement in industrial hydrogenation in many contexts. Such processes are common in the specialty chemical, pharmaceutical, food processing, and petroleum industries.