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three-dimensional (3d) macro-porous structures composed by carbon nanotubes (cnts) are synthesized by chemical vapor deposition (cvd) of methane at 1173 k and atmospheric pressure on co/mo/mg catalyst. 3d-structures are due to formation ofinterconnected cnt bundles. strong metal/support interaction, breaking of the metal particles and large difference between surface- and bulk-diffusion are at base of the “double-base” growth mechanism, proposed to account for their formation. the variation of ch₄ partial pressure (0.32–1.00 atm) reflects on changes in the products’ morphology and carbon yield. these changes result to be determined by the competition between effects (release of h₂ and spreading and diffusion of the carbon atoms over and into the catalyst) promoted by the ch₄ dissociation. at lower ch₄ partial pressure the rate of dissolution of the c atoms is faster than that of the co/mo dispersion and bundled cnts prevailingly form; at higher ch₄ partial pressure the situation inverts and unbundled component of the 3d-structures increases.

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详情可参考下面链接：

http://www.sciencedirect.com/science/article/pii/s0926860x15003270