Abstract
The interaction of discontinuous cobalt films with carbon at high temperature was investigated by transmission electron microscopy and electron diffraction. The experiments were performed with the carbon deposited during the disproportionation of CO at 653 K on cobalt films supported on SiO 2. The behavior of a Co SiO 2 + C system was compared with cobalt films supported on amorphous carbon. It was established that cobalt catalyzes graphitization of amorphous carbon above 773 K and that the conversion of amorphous to graphitic carbon proceeds through an intermediate state in which dissolution of carbon in cobalt takes place and carbide is formed. The formation Co 2C was observed after thermal treatment of the Co C and Co SiO 2 + C systems at 773 K.
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