The studies of the kinetics of the formation of carbon deposit in the result of the decomposition of methane on the nanocrystalline iron are presented. The experiments were carried out in the thermobalance-differential reactor in the temperature range of 500-600⁰C under atmospheric pressure. The kinetics of the carbon deposit formation has been studied in the reaction area where reaction rate has been limited by the dissociative adsorption of methane. The rate of the carbon deposit formation has been found to be proportional to the methane pressure. The activation energy of this process is about 150 kJ/mol. The dissociative adsorption of methane leading to the formation of carbon deposit occurs according to the same mechanism as the formation of iron carbide in the reaction of methane with nanocrystalline iron. The rate of the carbon deposit formation is proportional to the fraction of surface uncovered with carbon.
The formation of carbon deposit occurs in the result of the thermal decomposition of iron carbide. The process of the thermal decomposition of iron carbide is slower than the process of the reduction of iron carbide with hydrogen.

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