還元鉄ペレットを触媒とするメタンの生成反応速度

概要

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The methane formation reaction plays an important role in the ironmaking and the chemical processes. However, the reaction rate has not been studied enough for the catalyst of porous reduced iron pellets at elevated temperatures and pressures. In this paper, various parameters affecting the rate of the reaction was investigated in the wide ranges of temperature and pressure for clarifying the mechanism and the rate parameters. It is consequently found that the reaction rate increased with the increase in the total pressure and the rate was suppressed by carbon dioxide. As for the temperature dependence, the reaction showed the highest rate at about 873 K and the rate decreased in the temperature range over 873 K, because the CH_4 formed by the methanation reaction reacted with CO_2 to form CO and H_2. The effect of the pore structure of reduced iron pellet on the reaction rate can be described by considering the effectiveness factor. The apparent activation energy and the frequency factor for the rate of methane formation reaction were determined from the experimental data. The expression of the frequency factor contains pressure dependence.
社団法人日本鉄鋼協会の論文
1992-11-01