Acta Phys. -Chim. Sin. ›› 2009, Vol. 25 ›› Issue (11): 2380-2384.doi: 10.3866/PKU.WHXB20091121

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Synthesis of N-doped and Undoped Carbon Nanotubes on Fe/MgO Catalysts

CAO Yong, JIAO Qing-Ze, ZHAO Yun   

  1. School of Chemical Engineering and Environment, Beijing Institute of Technology, Beijing 100081, P. R. China|Institute of Environment and Municipal Engineering, North China Institute of Water Conservancy and Hydroelectric Power, Zhengzhou 450011, P. R. China
  • Received:2009-04-06 Revised:2009-08-29 Published:2009-10-28
  • Contact: ZHAO Yun E-mail:zhaoyun@bit.edu.cn

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Abstract:

N-doped and undoped carbon nanotubes (CNx and CNTs) were synthesized by the catalytic chemical vapor deposition of ethylenediamine and hexane on Fe/MgO catalysts. The Fe catalysts were obtained by calcination ofa Mg/Fe layered double hydroxide (LDH) and a mixture of Mg(NO3)2/Fe(NO3)3 precursors followed by reduction (Fe-LDH and Fe-Mg(NO3)2/Fe(NO3)3). The CNTs grown on both catalysts had tubular structures with hollow cores while some of the CNx grown on Fe-Mg(NO3)2/Fe(NO3)3 had a different morphology from the conventional bamboo-shape of those grown on Fe-LDH. This special morphology with thick walls had some space between the graphite layers. The molar content of N in the CNx grown on Fe-LDH was 6.3%, which was a little more than 5.7%found in the CNx grown on Fe-Mg(NO3)2/Fe(NO3)3. However, the latter has more defects and disorders.

Key words: Carbon nanotube, N-doped carbon nanotube, Layered double hydroxide, Catalyst, Precursor, Chemical vapor deposition