水性ガスシフト反応を考慮した緻密なウスタイト薄板の CO-H_2 混合ガスによる還元速度の解析

概要

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A mathematical model for the kinetics of reduction of wustite with CO-H_2 gas mixtures was developed based on the unreacted-core model. In this model, (i) the water-gas shift reaction with reduced iron as a catalyst was taken into consideration, and (ii) the diffusion rates of gases through the gas-film and the product iron layer were evaluated from the STEFAN-MAXWELL equations for multi-component diffusion. Reduction experiments of dense wustite foils with CO-H_2 gas mixtures were carried out at 1000℃ and the data obtained were analyzed by the above-mentioned mathematical model with the following results. (i) The effect of the water-gas shift reaction on the reduction kinetics was negligibly small. (ii) Relation between the reduction rate and gas composition showed negative deviation from the additivity, i.e. a linear combination of the rates of reduction with the pure component gases. It was attributed to the predominant contribution to the overall reaction resistance of the diffusional resistances through the gas-film and the product iron layer.
社団法人日本鉄鋼協会の論文
1985-04-01