An effect of concentration ratio between Co and Mo in catalysts on the yield and morphology of carbon nanotubes

D. A. Grishin, Yu V. Gavrilov, A. G. Nasibulin, H. Jiang, E. I. Kauppinen, S. S. Bukalov, L. A. Mikhalitsin, E. G. Rakov

Research output: Contribution to journalArticlepeer-review

10 Citations (Scopus)

Abstract

Products formed by methane pyrolysis (slow heating up to 1000°C) over Mo-Co/MgO catalysts with Mo and Co content of 5 mol. % and different Mo : Co ratio were studied by gravimetic analysis in combination with electron microscopy, Raman-spectroscopy and of specific surface measurement. It was shown that under the same reaction conditions the relative yield of solid products was maximum value (≈ 1.7 g/gCt) at the molar ratio Mo : Co = 3 : 1. At this condition, the product is consisted of carbon nanotubes with a small amount of carbon nanofibres. The utilisation of Co/MgO catalyst resulted in the formation of thin (double-walled) nanotubes. An increase of Mo concentration led to an increase of nanotube diameters and to a decrease of the amount of carbon nanofiber impurities.

Original languageEnglish
Pages (from-to)52-58
Number of pages7
JournalPoverkhnost Rentgenovskie Sinkhronnye i Nejtronnye Issledovaniya
Issue number12
Publication statusPublished - 2005
Externally publishedYes

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