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Seminars
Kinetic modeling of Single-Walled Carbon Nanotube growth on Co-Mo/SiO2 catalysts with same-particle characterization of catalysts and product
Daniel E. Resasco
School of Chemical, Biological and Materials Engineering
University of Oklahoma
When: Thursday, October 11, 2007
Time: 2:30 PM to 3:30 PM
Where: McMurtry Auditorium in Duncall Hall
Abstract:
In the past few years, we have investigated the disproportionation of CO on supported CoMo catalysts and have given evidence that this reaction can produce single-walled carbon nanotubes (SWNT) with high selectivity to the wanted product as opposed to other less desired forms of carbon, such as graphite nanofibers. In fact, the commercial CoMoCAT™ process, based on this reaction, currently makes SWNT with narrow diameter and chirality distributions.
In this contribution, we will describe a kinetic model that attempts to capture mathematically the various stages of the nanotube synthesis, including: a) catalyst carburization and activation; b) CO dissociation on the catalyst surface; c) nucleation and growth; d) termination. We will also describe same-particle TEM analysis of the catalysts and nanotubes during these stages combined with Raman spectroscopy, optical absorption (UV-vis and NIR), TGA, TPO, AFM, and electrical conductivity measurements.
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