Abstract
Analysis has been undertaken on the kinetics of gaseous hydrogen reduction of solid nickel oxide by considering elementary steps commonly found in gas-solid reactions, i.e., gas-film mass transfer, gas pore diffusion, and chemical reaction. It is demonstrated that these reaction steps alone cannot account for the observed rates. The analysis has therefore been extended to include recently obtained microstructural information on the reduction product. The study provides strong evidence for direct links between the overall reduction kinetics and the changes to the reduction product microstructures generated at the Ni-NiO interface.
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