Presidential Young Investigators Award: Partial Oxidations in Zeolites and Filamentous Materials for Composites

本届总统青年研究员奖包括三个项目：沸石的部分氧化、丝状材料和水-气变换反应。使用以多价离子交换阳离子(如铁、铜或钴)制备的沸石为基础的催化剂系统来研究部分氧化反应。实验旨在确定，对于给定的阳离子-沸石体系，是否可以通过改变离子负载量、硅铝比或其他阳离子交换离子的性质，或者通过改变其他原子对铝的骨架取代来改变多价位的氧化还原电位。使用这些材料进行了催化动力学研究，重点是甲烷的部分氧化。碳长丝的催化生产得到了很好的研究，并作为尝试改变长丝生产催化剂的起点，以便随后它可以用于催化形成长丝周围的基质；这将允许在一次操作中形成复合材料。最后，探讨了稀土在硫化钴钼催化剂上促进水煤气变换反应的机理。

Three projects are included in this Presidential Young Investigator Award: partial oxidation in zeolites, filamentous materials, and water-gas shift reactions. Partial oxidation reactions are studied using catalyst systems based on zeolites prepared using multivalent ion- exchange cations such as iron, copper, or cobalt. Experiments are designed to determine whether, for a given cation-zeolite system, it is possible to alter the redox potential of the multivalent sites by changing the ion loading, the silicon/aluminum ratio, or the nature of other cation-exchange ions, or by framework substitution of other atoms for aluminum. Catalytic kinetic studies are conducted using these materials with emphasis on the partial oxidation of methane. Catalytic production of carbon filaments is well studied and serves as the starting point for attempts to alter the filament-producing catalyst so that subsequently it can be used to catalyze the formation of a matrix around the filaments; this would permit formation of composites in a single operation. Finally, the mechanism by which rare earths promote the water-gas shift reaction over sulfided cobalt-molybdenum catalysts is investigated.