Novel Molecular Sieve Catalysts Based on Single-walled Carbon Nanotubes

点击翻译按钮获取中文摘要

This research will advance the state-of-the-art of carbon nanotube-based materials for applications in heterogeneous catalysis. Carbon nanotubes are a novel material with unusual structural, electronic, mechanical and chemicalproperties. The researchers have developed a unique capability to produce sizeable quantities of single-walled carbon nanotubes (SWNT) with controlled structure (diameter and length). The project will capitalize on this capabilityby focusing on the design of unique molecular sieve supports forheterogeneous catalysts, which would have the following characteristics:large diameter compared to typical zeolites, adjustable channel length, andchemical inertness. There is also the possibility of adjusting the support's aciditydensity, one-dimensionality, and enhanced molecular diffusivity. To reachthis goal, the SWNT diameters will be adjusted by modifying the synthesisreaction temperature and by selectively removing small diameter nanotubes bypreferential oxidation. Heterogeneous catalysts will then be synthesized with varying metal and acidity contents and tested for two reactions of great industrial importance. These are the aromatization of alkanes and the hydrogenation of aromatics in the presence of sulfur. Environmental concerns about aromatics have resulted in regulation that limit their handling and transportation as well as their content in diesel fuels and gasolines. The two processes to be investigated play an important part in minimizing the environmental impact of handling aromatics and diesel fuels. In order to broaden the impact of the research activities, undergraduate students,high-school teachers and selected high school students will participate inthe project. In collaboration with the American Indian Student Association,minority Engineering students will be selected to join the research program.