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|Title:||Synthesis of carbon nanotubes over transition metal ions supported on Al(OH)₃|
Reddy, K Vijayakumar
Nagy, J B
|IPC Code:||Int.Cl. ⁸ B01J21/00; B82B3/00|
|Abstract:||Production of carbon nanotubes on bi-metallic (Fe/Co, Co/Ni, Fe/Ni, Fe/Mo, Co/Mo, Ni/Mo) and trimetallic (Fe/Co/Mo, Co/Ni/Mo, Fe/Ni/Mo) catalysts supported on Al(OH)₃ by catalytic chemical vapor deposition is reported. The support-catalyst systems have been prepared by incipient dry impregnation method and characterized by BET, powder XRD, SEM, and TG/DSC techniques. The carbon nanotubes have been synthesized by allowing C₂H₂ and N₂ to pass over a catalyst bed at 700°C placed on a quartz plate in a tubular furnace. The carbon deposit is examined using TEM. All the catalysts have been found to be active to different extents for the production of multiwall carbon nanotubes of varying thickness (10-15 nm). In the case of catalysts containing Fe/Co or Fe/Ni, a carbon deposit to an extent of 210 to 220% of the initial weight of the catalyst is obtained. This deposit also contains good quantities of carbon nanotubes. The tubes produced on nickel catalysts have been found to be thin and long. The effect of molybdenum on the nature of the carbon nanotubes produced is dependant on whether it is associated with one or two of the other transition metal ions supported over Al(OH)₃. To synthesize good quantities of carbon nanotubes, a binary mixture of Fe, Co and Ni without Mo is the best.|
|Appears in Collections:||IJC-A Vol.47A(05) [May 2008]|
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