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A large amount of carbon nanotubes with uniform diameter were produced from catalytic decomposition of C2H2 or CH4 over perovskite oxide LaCoO3 catalyst precersor. The result of XRD measurement indicated that after reduction of LaCoO3 at 700 ○C cobalt existed chiefly as Co0 particles supported and separated by La2O3. La2O3 can prevent Co0 from agglomeration. The size of Co0 nanoparticles determined...
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