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.
|Number of pages||7|
|Journal||Poverkhnost Rentgenovskie Sinkhronnye i Nejtronnye Issledovaniya|
|Publication status||Published - 2005|