Carbon nanotubes prepared from CO on pre-reduced La2NiO4 perovskite precursor

A large amount multi-shelled carbon nanotubes with uniform diameter were ob tained from catalytic disproportionation of CO using La2NiO4 oxides as cata lyst precursor, which was prepared by citric acid complexing method. Nickel exists chiefly as Ni-0 particles supported on La2O3 after reduction of per ovskite-like mixed oxide La2NiO4 These nano-scale Ni-0 particles play a key role for the growth of carbon nanotubes. Transmission electron microscopy, scanning electron microscopy, X-ray diffraction, Raman spectroscopy, and o xidation weight loss analysis were employed to reveal the morphology and mi croscopic structure of carbon nanotubes. (C) 2001 Elsevier Science Ltd. All rights reserved.