Abstract
The deposition behavior of carbon on iron from CH4-H2 mixtures in the form of pyrolitic carbon and soot as well as filmy carbon and filamentous carbon at 1203-1373K has been studied. Deposition of filmy carbon and filamentous carbon on iron was observed under most reaction conditions, while pyrolitic carbon and soot were found to form in nearly pure CH4 at temperatures above 1273K and to be significantly influenced by the residence time of the gas. In the region of deposition of filmy carbon and filamentous carbon, the amount of carbon deposit decreased when a certain CH4 concentration was exceeded, and as temperature increased the CH4 concentration shifted downward. This may be caused by the fact that under such conditions the nucleation of filamentous carbon is retarded because Fe3C formed on iron dissolved into the substrate rather than decomposing. Also, even in the region of formation of pyrolitic carbon and soot, filmy carbon was found to deposit on iron at an early stage and to retard the subsequent formation of pyrolitic carbon and soot since it prevents contact between the iron substrate and CH4 gas.
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