Reduction of iron oxide catalysts: the investigation of kinetic parameters using rate perturbation and linear heating thermoanalytical techniques

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TABLE 4: Comparison of Kinetic Models and Activation Energies for the Reduction of Fe2O3 Found in This Work and in the
Literature
source reduction step reduction mechanism E (kJ mol-1) method
Wimmers et al.1 Fe2O3 f Fe3O4 n/dc n/dc linear heating rate
Fe3O4 f Fe random nucleation 111 linear heating rate
Shimokawabe et al.2 Fe2O3 f Fe3O4 random nucleation 74-117a linear heating rate
Fe3O4 f Fe phase boundary 60-73a linear heating rate
Sastri et al.3 Fe2O3 f Fe phase boundary 57-73a isothermal
this work Fe2O3 f Fe3O4 n/dc 106 linear heating rate
Fe3O4 f Fe n/dc 54 linear heating rate
this work Fe2O3 f Fe3O4 phase boundary 96 CRTA “rate-jump”
Fe3O4 f Fe random nucleation 59-69b CRTA “rate-jump”
a depending on heating conditions employed for pretreatment prior to reduction. b depending on the extent of reduction. c n/d - not determined.
Reduction of Iron Oxide Catalysts J. Phys. Chem. B, Vol. 105, No. 1, 2001 227
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228 J. Phys. Chem. B, Vol. 105, No. 1, 2001 Tiernan et al.