Synthesis of coiled carbon nanotubes on Co/Al2O3 catalysts in a fluidised-bed |
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Authors: | Jun Liu and Andrew T Harris |
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Institution: | (1) Laboratory for Sustainable Technology, School of Chemical and Biomolecular Engineering, University of Sydney, Building J01, Darlington, NSW, 2006, Australia; |
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Abstract: | Mixtures of regularly coiled and straight multi-walled carbon nanotubes (MWNTs) were synthesised on alumina supported Co catalysts
prepared by pH controlled, wet impregnation. The synthesis reaction was performed under C2H2:H2:N2 at 750 °C in a fluidised-bed for 30 min. Scanning electron microscopy/energy dispersive X-ray spectroscopy shows good distribution
of the active Co particles on the surface of the alumina support. Determined from 10 individual SEM images from the same product
batch, the CNTs present are typically from 10 to 40 nm in diameter. Thermogravimetric analysis (TGA) and Raman spectroscopy
indicate the total oxidative weight loss is independent of pH during catalyst preparation. This study is the first to report
the use of a fluidised-bed for the synthesis of coiled MWNTs, using alumina supported Co catalysts. |
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