Interactions of Metal Clusters with Pore Walls

金属团簇与孔壁的相互作用

• 批准号: 9525797
• 负责人: Gary Haller
• 金额: $ 36.05万
• 依托单位: Yale University
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 1995
• 资助国家: 美国
• 起止时间: 1995-12-01 至 1998-11-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9525797&HistoricalAwards=false
• 关键词: Interactions; Metal; Clusters; Pore; Walls

ABSTRACT CTS-9525797 This is a fundamental study of the role of radius of curvative in an oxide pore in catalytic interactions. It has not been possible to study this effect systematically until now; the discovery of mesoporous aluminosilicate molecular sieves provides a means of preparing oxide supports with uniform pores of varying sizes. The interactions of small platinum clusters with the walls of mesoporous (1.5-2.5 nm) molecular sieves (MCM-41 materials) having silicon/aluminum ratios greater than 3 are investigated. The principal tools are solid-state nuclear magnetic resonance spectroscopy and X-ray absorption spectroscopy. Chemisorption, physical adsorption, small-angle X-ray diffraction, and infrared, ultraviolet, and visible spectroscopies are also used. Three catalytic test reactions are employed: n - hexane aromatization to probe for small-particle stabilization against sintering and coke deactivation; neopentane hydrogenolysis and isomerization as a probe of metal-support interactions; and competitive hydrogenation of benzene and toluene to observe effects on adsorption. Mesoporous molecular sieves offer a control of the surface environment not heretofore available. It has not yet been established that this control can be exploited for practical ends. This project will provide a basis for evaluating the possibilities. ***

摘要CTS-9525797 这是对氧化物孔曲率半径在催化相互作用中作用的基础性研究。 直到现在还不可能系统地研究这种效应;中孔铝硅酸盐分子筛的发现提供了制备具有不同尺寸的均匀孔的氧化物载体的手段。 研究了小铂团簇与硅铝比大于3的介孔分子筛（1.5-2.5 nm）（MCM-41材料）的相互作用。 主要工具是固态核磁共振光谱和X射线吸收光谱。 化学吸附、物理吸附、小角X射线衍射、红外、紫外和可见光谱也被使用。 采用三种催化测试反应： 正己烷芳构化以探测小颗粒稳定化以防止烧结和焦炭失活;新戊烷氢解和异构化作为金属-载体相互作用的探测器;以及苯和甲苯的竞争性氢化以观察对吸附的影响。 介孔分子筛提供了迄今为止没有的表面环境的控制 available. 目前还没有确定这种控制可以用于实际目的。 该项目将为评估各种可能性提供基础。 ***