Gaseous‐Transport‐Controlled Chlorination of CoO in Flowing Oxygen Chlorine‐Argon Mixtures at 1000 K

Abstract

Thde chlorination rate of CoO was measured in 1 % CI2‐Ahd mixtures at 1000 K as a function of oxygen partial pressure and total volume flow rate. At oxygen partial pressures >4053 Pa (0.04 atm), the rate of chlorination was found to be controlled by the transport of CoCI2(g) across the gas boundary layer. The good agreement obtained between the calculated and measured rates suggests that the partial pressure of CoCI2(g) at the gas‐solid interface is determined by the equilibrium between Co3O4(s) and the partial pressure of Cl2(g) and O2(g) in the gas mixtures. At lower partial pressures of oxygen, the rate is controlled by mixed gas diffusion of Cl2(g) and CoCI2(g) species through the gas boundary layer.