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Korean Carbon Society (한국탄소학회)
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Synthesis of thin-multiwalled carbon nanotubes by Fe-Mo/MgO catalyst using sol-gel method

  • Dubey, Prashant (Centre of Material Sciences, Institute of Interdisciplinary Studies, University of Allahabad) ;
  • Choi, Sang-Kyu (School of Electrical Engineering, Korea University) ;
  • Kim, Bawl (School of Electrical Engineering, Korea University) ;
  • Lee, Cheol-Jin (School of Electrical Engineering, Korea University)
  • Received : 2012.01.07
  • Accepted : 2012.02.13
  • Published : 2012.04.30
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Abstract

The sol-gel technique has been studied to fabricate a homogeneous Fe-Mo/MgO catalyst. Ambient effects (air, Ar, and $H_2$) on thermal decomposition of the citrate precursor have been systematically investigated to fabricate an Fe-Mo/MgO catalyst. Severe agglomeration of metal catalyst was observed under thermal decomposition of citrate precursor in air atmosphere. Ar/$H_2$ atmosphere effectively restricted agglomeration of bimetallic catalyst and formation of highly-dispersed Fe-Mo/MgO catalyst with high specific surface-area due to the formation of Fe-Mo nanoclusters within MgO support. High-quality thin-multiwalled carbon nanotubes (t-MWCNTs) with uniform diameters were achieved on a large scale by catalytic decomposition of methane over Fe-Mo/MgO catalyst prepared under Ar-atmosphere. The produced t-MWCNTs had outer diameters in the range of 4-8 nm (average diameter ~6.6 nm) and wall numbers in the range of 4-7 graphenes. The as-synthesized t-MWCNTs showed product yields over 450% relative to the utilized Fe-Mo/MgO catalyst, and indicated a purity of about 85%.

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References

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