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By using a Ni-MgO catalyst, carbon nanotubes with small and even diameter could be prepared from catalytic decomposition of CH 4 or CO. These carbon nanotubes prepared by this method are more or less twisted, with the outer diameter at 15-20 nm, and the tube length up to 10 μm. The results of XRD measurements and pulse reaction testing indicated that the NiO and MgO components in this catalyst...
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