Abstract
The calcination and hydrogen reduction behavior of Fe-/Ni-nitrate and Fe-/Co-nitrate have been investigated. The powder mixtures of metal oxides were prepared by solution mixing and calcination of metal nitrates. Thermogravimetry and microstructural analysis revealed that the nitrate mixtures by the calcination at 300–350 °C for 2 h were changed to Fe-oxide/NiO and Fe-oxide/Co3O4 composite powders with an average particle size of about 100 nm. The reduction behavior of the calcined powders was analyzed by thermogravimetry with different heating rates in a hydrogen atmosphere. The hydrogen reduction kinetic was evaluated by the amount of peak shift with heating rates. The activation energies for the reduction, estimated by the slope of the Kissinger plot, were measured as 83–100 kJ/mol depending on reduction steps.
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