The reactions between CO₂ gas and liquid Fe–C alloy with different initial carbon concentrations at 1873 K were investigated using experimental results, thermodynamic equilibrium, and kinetic analysis. The average CO₂ conversion is greater than 80% when the carbon content ranges from 4.0 to 1.0 wt.%. When the carbon content decreases from 0.5 to 0.1 wt.%, the average CO₂ conversion diminishes from 83.50% to 40.84%. This proves that CO₂ gas and liquid Fe–C alloy reaction does not reach equilibrium under experimental conditions compared with the calculated thermodynamic data. Through the kinetic analysis, it is shown that in the medium- to high-carbon liquid Fe–C alloys, the rate-controlling step involves CO₂ gas mass transfer or mixed rate-controlling of CO₂ gas mass transfer with adsorption and dissociation of CO₂ gas. In contrast, in the low-carbon liquid Fe–C alloy, carbon mass transfer occurs in the molten alloy. The critical carbon content of the rate-controlling step transformation is 0.7937 wt.%.

使用实验结果、热力学平衡和动力学分析研究了CO ₂气体与具有不同初始碳浓度的液态 Fe-C 合金在 1873 K 下的反应。当碳含量为 4.0 至 1.0 重量％时，平均 CO ₂转化率大于 80％。当碳含量从 0.5 重量％减少到 0.1 重量％时，平均 CO ₂转化率从 83.50％减少到 40.84％。这证明与计算的热力学数据相比，CO ₂气体和液体Fe-C合金反应在实验条件下没有达到平衡。通过动力学分析表明，在中高碳液态 Fe-C 合金中，速率控制步骤涉及 CO ₂气体传质或混合速率控制CO的₂与CO的吸附和解离的气体传质₂气体。相反，在低碳液态 Fe-C 合金中，碳在熔融合金中发生传质。速率控制步骤转变的临界碳含量为 0.7937 wt.%。