Effect of process conditions on the synthesis of carbon nanotubes by catalytic decomposition of methane--颗粒学报PARTICUOLOGY

Zhan, S., Tian, Y., Cui, Y., Wu, H., Wang, Y., Ye, S., & Chen, Y. (2007). Effect of process conditions on the synthesis of carbon nanotubes by catalytic decomposition of methane. China Particuology, 5(3), 213–219. https://doi.org/10.1016/j.cpart.2007.03.004

Effect of process conditions on the synthesis of carbon nanotubes by catalytic decomposition of methane

Shuanglin Zhan ^a b, Yajun Tian ^a *, Yanbin Cui ^a b, Hao Wu ^c, Yonggang Wang ^c, Shufeng Ye ^a, Yunfa Chen ^a

a Institute of Process Engineering, Chinese Academy of Sciences, Beijing 100080, China
b Graduate University of Chinese Academy of Sciences, Beijing 100049, China
c China University of Mining and Technology, Beijing 100083, China

10.1016/j.cpart.2007.03.004

Volume 5, Issue 3, June 2007, Pages 213-219

Received 25 December 2006, Accepted 24 March 2007, Available online 6 June 2007.

E-mail: yjtian@home.ipe.ac.cn

Highlights

Abstract

A new dual-composition catalyst based on Ni–Mo/MgO with high efficiency of producing carbon nanotubes (CNTs) from methane was reported recently. In the present article, with this type of catalyst, the impact of such experimental parameters as reaction temperature, reaction time, concentration of H₂, flow rate ratio of CH₄ to H₂ on yield and graphitization were investigated, leading to the following optimal growth conditions: reaction time 60 min, reaction temperature 900 °C, CH₄:H₂ about 100:20 mL/min, under which high-yield multi-walled CNTs bundles were synthesized. Raman measurement indicated that the as-synthesized product was well-graphitized, and the purity was estimated over 95% by TG–DSC analysis. In terms of the above results, an explanation of high-efficiency formation of CNTs bundles and the co-catalysis mechanism of Ni–Mo/MgO were suggested.

Graphical abstract

Keywords

Carbon nanotubes; Catalytic decomposition; Carbon yield; Graphitization degree

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