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- W2000320329 abstract "High-purity iron has been oxidized at 1,000-1,200C in CO{sub 2} and in CO{sub 2} + CO with different compositions and at different total gas pressures (0.1-1 atm.). The experimental work has comprised thermogravimetric reaction rate measurements and characterization of the wuestite scales by metallography and x-ray diffraction. The overall results have been analyzed in terms of a classical model for coupled linear/parabolic kinetics, where it is assumed that the surface of growing wuestite scales has exactly the same defect structure and defect concentrations as that of bulk wuestite equilibrated in the same gaseous atmospheres. Important discrepancies are found between the predicted and the experimentally observed reaction behavior. Thus, both the linear and parabolic rate constants are found to be dependent on the partial pressure of CO{sub 2} and the total gas pressure of the CO{sub 2} + CO gas mixtures, and furthermore, the reaction in CO{sub 2} + CO is slower than in O{sub 2} and in H{sub 2}O + H{sub 2} with the same oxygen activity. In order to explain the experimental results, it is suggested that CO and CO{sub 2} molecules interact with the wuestite surface and thereby affect the defect structure and defect concentrations in a thinmore » surface layer, and that this, in turn, affects both the linear and parabolic reaction rates.« less" @default.
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- W2000320329 date "1991-08-01" @default.
- W2000320329 modified "2023-09-27" @default.
- W2000320329 title "On the oxidation of iron in CO sub 2 + CO mixtures. 3: Coupled linear parabolic kinetics" @default.
- W2000320329 hasPublicationYear "1991" @default.
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