Carbon Nanotubes Growth on Calcium Carbonate Supported Molybdenum-Transition Metal Catalysts

摘要

A comparison of different catalyst systems (Ni, Co, Fe/Mo nanoparticles supported on CaCO_3) has been performed in order to optimize the carbon nanotube (CNT) growth. The influences of the reaction temperature, metal loading and carbon source on the synthesis of CNTs were systematically investigated. Dense CNT networks have been synthesized by thermal chemical vapor deposition (CVD) of acetylene at 720°C using the Co-Mo/CaCO_3 catalyst. The dependence of the CNT growth on the most important parameters was discussed exemplarily on the Co catalyst system. Based on the experimental observations, a phenomenological growth model for CVD synthesis of CNTs was proposed. The synergy effect of Mo and active metals was also discussed.