The Role of Structure and Conductivity of Perovskites Bi4V2−2xM2xO11−δ (M = Cu2+, Fe3+, Zr4+) in the Catalytic Dehydrogenation of Isobutanol

Resumo

The catalytic activity of solid electrolytes from the family of complex bismuth vanadates Bi₄V_2−2xM_2xO_11−δ (BIMEVOX) with V5⁺ ions partially substituted by 3d metal cations was studied. In the transformations of isobutanol, it was found to depend on the crystal structure (α, β, γ Aurivillius phases), which changes at increased dopant ion contents (x_M). The highly conductive tetragonal γ phase was most active for all BIMEVOX oxides. The activation energy of the dehydrogenation of isobutanol E_a^C=O increased linearly with the charge of the Mⁿ⁺ ion and activation energy of conductivity of the γ phase of BIMEVOX in the series Cu²⁺ → Fe³⁺ → Zr⁴⁺.