每周分享９�/span>Synthesis of three-dimensional macro-porous networks of carbon nanotubes by chemical vapor deposition of methane on Co/Mo/Mg catalyst

今天给大家分享的�?/span>2015平�/span>5月份〉�/span>Applied Catalysis A: General》上发表的一篇名为：Synthesis of three-dimensional macro-porous networks of carbon nanotubes by chemical vapor deposition of methane on Co/Mo/Mg catalyst

文章摘要如下９�/span>

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 ofinterconnectedCNT 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 CH₄partial pressure (0.32�?.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 H₂and spreading and diffusion of the carbon atoms over and into the catalyst) promoted by the CH₄dissociation. At lower CH₄partial 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 CH₄partial pressure the situation inverts and unbundled component of the 3D-structures increases.