Catalysts based on vanadyl phosphates have been prepared for the oxidative dehydrogenation (ODH) of ethane to ethylene. The bulk catalysts VOP (VOPO4.2H2O), FeVOP(1) (Fe0.14VO0.86PO4) and FeVOP(2) (Fe0.21VO0.79PO4) have been synthesized by the Ladwig method, which consists in the preparation of vanadyl phosphate under reflux with phosphoric acid. The catalysts supported on γ-Al2O3 (FeVOP-Al) were prepared by the wet impregnation method. From XRD, the bulk catalysts presented crystalline structures described by the arrangement of the tetrahedral of PO4 and of the octahedral VO6. The TPR analysis revealed that the introduction of Fe to the structure of the VOP forms less reducible species and in the case of the supported samples, the increase of the active phase linearly increased the consumption of H2. The γ-Al2O3 support to the iron-vanadyl-phosphate catalysts allowed the formation of ...