Abstract
The linear kinetics of the monosulfide scale formation and reduction according to the overall reaction Fe(s) + COS(g) = FeS(s) + CO(g) in COS-CO-CO2 gas mixtures was studied in the temperature range 750–910† C by a thermogravimetric technique. The validity of the linear rate law is limited to short times of exposure and relatively low partial pressures of COS. A proposed model for the sulfidation reaction implies that both adsorption of COS and dissociation of adsorbed COS are involved in the rate-limiting steps. For the reverse reaction it is suggested that both adsorption of CO and recombination of adsorbed CO with sulfur either in an adsorbed state or incorporated in the sulfide lattice are the rate-controlling steps. The theory of absolute reaction rates was applied to the proposed reaction model. Activation enthalpies and entropies for both the sulfidation and the reduction process were derived. From these data standard enthalpy and entropy changes for the overall reaction were evaluated and found to be in close agreement with thermochemical data from the literature.
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Haugen, S., Sterten, A. High-temperature linear kinetics of FeS formation and reduction in COS-CO-CO2 gas mixtures. Oxid Met 3, 545–555 (1971). https://doi.org/10.1007/BF00605002
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DOI: https://doi.org/10.1007/BF00605002