Journal
ENERGY & FUELS
Volume 28, Issue 8, Pages 5406-5414Publisher
AMER CHEMICAL SOC
DOI: 10.1021/ef501100b
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- U.S. DOE through office of Fossil Energy's Gasification Technology and Advanced Research
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Kinetics analysis of hematite (Fe2O3) reduction by hydrogen was evaluated by the thermogravimetric analyser (TGA) in the temperature range of 700-950 degrees C, using continuous streams of 5, 10, and 20% H-2 concentrations in N-2. A number of kinetic models have been considered, including the single and multi-step models to describe the experimental reduction data. The details of nucleation and growth during the isothermal reduction are described in terms of the local Johnson-Mehl-Avrami (JMA) exponent and local activation energy. The variations of n values (JMA exponent) and activation energies for the reduction conversion indicate the presence of the multi-step reaction process. The reduction was shown to be one-dimensional (1D) growth with a decrease in the nucleation rate.
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