Article

Catalysis Letters

, Volume 131, Issue 3, pp 356-363

Carbon Nanotube Growth on Calcium Carbonate Supported Molybdenum-Transition Bimetal Catalysts

  • Zhongrui LiAffiliated withNanotechnology Center and Applied Science, University of Arkansas at Little Rock Email author 
  • , Enkeleda DervishiAffiliated withNanotechnology Center and Applied Science, University of Arkansas at Little Rock
  • , Yang XuAffiliated withNanotechnology Center and Applied Science, University of Arkansas at Little Rock
  • , Viney SainiAffiliated withNanotechnology Center and Applied Science, University of Arkansas at Little Rock
  • , Meena MahmoodAffiliated withNanotechnology Center and Applied Science, University of Arkansas at Little Rock
  • , Olumide Dereck OshinAffiliated withNanotechnology Center and Applied Science, University of Arkansas at Little Rock
  • , Alexandru R. BirisAffiliated withNational Institute for Research and Development of Isotopic and Molecular Technologies
  • , Alexandru S. BirisAffiliated withNanotechnology Center and Applied Science, University of Arkansas at Little Rock

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Abstract

A comparison of different catalyst systems (Fe–Mo, Co–Mo or Ni–Mo nanoparticles supported on calcium carbonate) 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 investigated. Dense CNT networks have been synthesized by thermal chemical vapor deposition (CVD) of acetylene at 720 °C using the Co–Mo/CaCO3 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.

Keywords

Carbon nanotubes CVD Co–Mo/CaCO3 catalyst hydrocarbon