The equilibrium constant for the reaction of ZnO + H2and the chemical vapor transport of zno via the Zn + H2O reaction

Using a gas transpiration method, the equilibrium constant for the reaction ZnO(s) + H2(v)⇄ Zn(v) + H2O(v) was determined directly in the temperature interval 592–950°C. The data are described by the equation log10K = [-11.794 × 103/T] + 8.040 with ΔH° = 53.97 Kcal/mole and ΔS° = 36.79 e.u. Based on this Information, vapor-solid gas concentration curves useful for defining conditions for the chemical vapor transport of ZnO via the reverse of the above reaction have been computer calculated.