Transient Response of Chemically lnteracting Solid-Gas Systems

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Abstract
The transient behavior of the reacting system: on cobalt ferrite, , was studied experimentally by perturbing the reaction steady state with a rapid variation in the and partial pressures, at 190° and 300°C. To follow the nonsteady behavior, measurements were carried out on the time dependence of the reaction conversion and of the thermoelectric power of the sample. The latter quantity was used to calculate the variation of excess or defect electron concentration of the sample during the transient state. Two ferrite samples were used: and . The experimental results have been analyzed according to the treatment of nonsteady reaction rates presented in the previous communication. The analysis showed that at 300°C the oxygen, adsorbed on the cobalt ferrite surface during reaction, is in the form of neutral oxygen atoms, O, for n‐type cobalt ferrite, and intermediate between neutral oxygen and singly ionized oxygen ions, O−, for p‐type samples. At 190°C, adsorbed oxygen is wholly in the form of O− ions. The results are discussed in the light of previous studies on the structure and surface reactivity of .

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