Interfacial Rate of CO2–CO Reaction with the Solid Iron and Iron Oxide by Isotope Exchange Technique at 1273 K

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The interfacial rate constant of CO2–CO reaction with the solid iron and iron oxide has been measured by means of the isotope exchange reaction at 1273 K. Changing the total flowrate, the composition of CO2/CO of gas mixture and the reaction area, the effects of experimental conditions on rate constant were investigated. Varying the CO2/CO ratio in the range of 0.1 to 10, the dependence of rate constant on CO2/CO ratio was studied. It is found that the relationship of the rate constant and CO2/CO ratio can be divided to three regions represented iron, wüstite and magnetite phase field, respectively. In three phase regions, the slopes of the linear relationship of logkc and log(CO2/CO) were about –0.48, –1.14 and –1.71, respectively. The microstructure of reaction surface of sample was also observed by SEM, with the CO2/CO ratio, the reacted surface became less smooth and showed the crystal morphology.