Carbon Filaments as a Novel Catalyst Support Medium

[222572]泰瑞·贝克这是一种利用碳丝作为催化剂载体的技术。催化生长的碳丝同时具有活性炭和石墨的性质；它们具有很高的表面积，但是一种有序的石墨微晶体阵列，具有高密度的活性边缘位点。在这项工作中，注意力集中在铂或铁颗粒在碳丝上的催化行为以及碳丝本身的催化性能上。正在调查的具体问题包括使用氧化处理来增加长丝的表面积；将铂或铁颗粒引入表面的方法；不同反应条件下负载颗粒的结构和化学变化；并比较了碳丝负载金属颗粒与传统载体上金属颗粒的催化活性。采用的技术组合包括可控气氛电子显微镜，原位电子衍射，热重法，化学吸附，温度编程解吸和流动反应器研究。高表面积碳丝作为催化剂、催化剂载体或分离（吸附）剂在许多工业和污染控制场合具有应用和优势。这是一个高风险的调查。

9222572 Terry Baker This is an exploitation of carbon filaments as a catalyst support medium. Catalytically grown carbon filaments have attributes both of active carbon and of graphite; they have high surface area but are an ordered array of graphitic microcrystals with a high density of active edge sites. In this effort, attention is focussed on the catalytic behavior of platinum or iron particles supported on carbon filaments and on the catalytic properties of the carbon filaments themselves. Specific issues under investigation include the use of oxidation treatments to increase the surface areas of the filaments; methods of introducing platinum or iron particles onto the surface; structural and chemical changes of supported particles under various reaction conditions; and comparisons of the catalytic activities of carbon-filament-supported metal particles with those of particles on conventional support media. A combination of techniques is employed including controlled-atmosphere electron microscopy, in-situ electron diffraction, thermogravimetry, chemisorption, temperature-programmed desorption, and flow-reactor studies. The high-surface-area carbon filaments may have applications and advantages in a number of industrial and pollution control situations as catalysts, catalyst supports, or separations (adsorption) agents. This is a high-risk investigation.