抄録
In order to elucidate the reduction rate of zinc oxide with metallic iron and CO, kinetic experiments were carried out in the temperature range between 1, 171 and 1, 473 K. Experimental data for each reduction were analyzed by the isothermal unreacted core model and the isothermal shrinking model, respectively.
For the reduction of zinc oxide with metallic iron the specific permeability kp of zinc vapor is expressed by the following equation:
log (kp/m2)=-19.398+0.8767×104 T-1/K-1
Under the experimental conditions the overall rate is controlled by the permeation of zinc vapor through the pores of the product layer formed.
Under the experimental conditions the overall rate is controlled by the permeation of zinc vapor through the pores of the product layer formed.
For the reduction of zinc oxide with CO the reaction rate constant/cc is obtained by the following equation and the activation energy is 162kJ-mol-1 in the temperature range 1, 273-1, 473 K.
kc/10-2m·s-1=exp {9.766-161.7×103/(RT)}(1, 273-1, 473K)
The chemical surface reaction controlls the overall reaction rate under the present experimental conditions.
