Determination of the intrinsic kinetics of iron oxide reduced by carbon monoxide in an isothermal differential micro-packed bed

The intrinsic kinetics of iron oxide reduced by carbon monoxide is evaluated by a method of online measuring concentration of off-gas in an isothermal differential micro-packed bed. Under the condition of getting away from the influence of gas diffusion and gas–solid heat transfer and mass transfer, the reaction of Fe2O3 to Fe3O4, Fe3O4 to FeO and FeO to Fe in the process of single reaction can be clearly distinguished from each other, and the relevant activation energy is characterized to be 75.4, 74.4, and 84.0 kJ·mol− 1, respectively. Therefore, the change of surface area in the reaction process due to losing oxygen could be easily calculated by combining it with pre-exponential parameters of Arrhenius equations. In conclusion, these kinetic parameters are verified by the experimental data for the process of ore reduced by carbon monoxide in a packed bed.

Graphical AbstractIn this paper, the intrinsic kinetic parameters for reducing iron oxide by carbon monoxide are determined in a micro-packed bed under the isothermal conditions. As being shown in the figure, the relevant three successive reactions for reducing iron oxide can be separately distinguished from each other. Therefore, the changes of the iron oxide specific surface in the reaction process can be included in the pre-exponential parameters of Arrhenius equation. Additionally, under the condition of getting away from the influence of heat transfer and mass transfer and gas diffusion, the relevant kinetic parameters are evaluated.Figure optionsDownload full-size imageDownload as PowerPoint slide