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Keywords:

  • reduction;
  • isothermal kinetics;
  • non-isothermal kinetics;
  • double reactions;
  • metal oxides;
  • hydrogen

Abstract

In this paper, a new kinetic model has been developed for reduction of metal oxides with hydrogen under both isothermal and non-isothermal conditions. This model describes the kinetics of single reductive reaction and double reductive reactions by considering the diffusion and chemical reaction controlling mechanisms. In particular, the model is in the analytic form of expressing the reduction extent as an explicit function of time, temperature, radius of the particle, and hydrogen partial pressure, which is convenient for using and theoretical analysis. The reduction kinetics of nickel oxide, natural ilmenite, and Fe2MoO4 agree well with the theoretical results by the present model.