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The redox reaction between thin wüstite foil and CO2 or CO was studied by means of a microbalance in a temperature range 900–1075°C. It was found that the reaction at the gas-wüstite interface is rate-controlling and that the reaction rate is expressed as V_ox=k_OP_CO2a_O^-m/3 and V_red=k_O’P_COa_O^n/3 where aO is the oxygen activity of wüstite, and m and n are 2.1–2.2 and 0.8–1.2, respectively. On the basis of the theory by Kobayashi and Wagner, the most predominant mechanism is concluded to be CO_2+2\ominus\ightleftarrowsCO+O^2- Actigation energies for kO and kO′ were 35+3 and 32+3 kcal/mol, respectively.

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