Hydrogen temperature programmed reduction based on water analysis

Profiles of temperature programmed reduction (TPR) of V₂O₅ under H₂ have been studied through water analysis. This new approach enhances the sensitivity of the method. The influence of experimental parameters on the temperature corresponding to the maximum reduction rate,T _m, has been studied. The hydrogen concentration and heating rate are the two major factors that influenceT _m. In our method, the amount of solid and the flow rate are also important factors in monitoring of profile distortions attributed to water condensation at the outlet of the reactor. An approach of the mechanism of reduction of V₂O₅ has been carried out. The best kinetic model which describes the reduction rocess is the Avrami-Erofeev tridimensional nucleation model.