The Role of Structure and Conductivity of Perovskites Bi4V2−2x M2x O11−δ (M = Cu2+, Fe3+, Zr4+) in the Catalytic Dehydrogenation of Isobutanol

Abstract

The catalytic activity of solid electrolytes from the family of complex bismuth vanadates Bi 4 V 2 -2x M 2x O 11 -δ (BIMEVOX) with V 5+ 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 (х М ). The highly conductive tetragonal γ phase was most active for all BIMEVOX oxides. The activation energy of the dehydrogenation of isobutanol Е increased linearly with the charge of the M n+ ion and activation energy of conductivity of the γ phase of BIMEVOX in the series Cu 2+ → Fe 3+ → Zr 4+ .

New silicon substituted BiMeVOx: synthesis and study of structural properties in relation to ionic conductivity

“…Several references are available in the literature concerning the effect of the substitution of vanadium (V 5+ ) by monovalent, divalent, trivalent, tetravalent, and pentavalent cations. BiMeVO x : Me = Cu 2+ , 9,10 Fe 3+ , 9 Zn 2+ , 10 Co 2+ , 11 Ti 4+ , 12 (Cu 2+ , Ti 4+ ), 13 (Cu 2+ , Al 3+ ), 14 (Al 3+ , Ti 4+ ), 15 P 5+ , 16 and (Ti 4+ , Nb 5+ ). 17 The present work is devoted to the structural analysis of Bi 4 V 2 O 11 as well as to the Si( iv ) doped series Bi 4 V 2− x Si x O 11− δ (0.1 ≤ x ≤ 0.4).…”