Author： Hu Y.H. Ruckenstein E.
Publisher： Academic Press
ISSN： 0021-9517
Source： Journal of Catalysis, Vol.184, Iss.1, 1999-05, pp. : 298-302
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Abstract
The carbon deposition due to the CH4decomposition at 790°C over NiO/MgO catalysts was investigated by high-resolution transmission electron microscopy. While no deposits could be detected over the catalysts with a NiO content smaller than 9.1 wt%, they were detected over the catalysts with NiO contents of 23 and 50 wt%. The carbon deposits are composed of platelets located at distances of about 0.34 nm, corresponding to the graphitic carbon. Various structures of the deposited carbon were observed: (a) carbon consisting of platelets parallel to the surface of the particle, which covers a catalyst particle, (b) nanotubes composed of platelets parallel to their axis, and (c) carbon vortexes consisting of platelets parallel to their axis.
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