AFM and STM Studies of Model and Microfabricated Catalysts

使用原子力显微镜（AFM）和扫描的技术 隧道显微镜（STM）应用于调查 铂和钯模型催化剂。 这些方法 这是在上一次授予这个实验室时开发的。 三 研究了系统的类型：单晶，薄膜， 和通过使用的技术制备的微制造模型催化剂 在微电子器件制造中;最后一个是尝试 为了控制负载的纳米颗粒的粒度和形态， 催化 催化剂的活性和选择性 对于1，3-丁二烯的氢化测量。 吸附 用红外光谱法研究物种。 的尝试 用来描述活性部位，并将物理和 具有活性和选择性的化学特性。 这是对这些新方法在催化剂中的实用性的检验 表征和设计。 这些方法能够非常有效地 高分辨率可能（或可能不）有助于 了解实际系统。

Techniques using atomic force microscopy (AFM) and scanning tunnelling microscopy (STM) are applied to the investigation of platinum and palladium model catalysts. These methods were developed during the previous grant to this laboratory. Three types of systems are studied: single crystals, ultrathin films, and microfabricated model catalysts prepared by techniques used in microelectronic device fabrication; the last is an attempt to control the particle size and morphology of a supported catalyst. Catalytic activity and selectivity of these catalysts is measured for the hydrogenation of 1,3 - butadiene. Adsorbed species are studied with infrared spectroscopy. An attempt is made to describe the active sites and to correlate physical and chemical features with activity and selectivity. This is a test of the utility of these new methods in catalyst characterization and design. The methods are capable of a very high degree of resolution that may (or may not) be helpful in understanding practical systems.