Mixed Oxide-ion and Electrical Conductive Perovskite Type Oxide for High Temperature Reduction of CO₂

Abstract

Using a good mixed oxide ion and electrical conductor makes it possible to reduce CO₂ to CO even by the unelectrical methods. The La(Sr)CrO₃-based perovskite oxide was chosen as the mixed conductor because these oxides are stable under a reduced condition. In order to increase the oxide ion conductivity, Ga was doped for Cr site synthesizing La_1-xSr_xCr_1-y(Ga_1-zMg_z)_yO_3-δ La_1-xSr_xCr_1-y(Ga_1-zMg_z)_yO_3-δexhibit high electronic and oxide ionic conductivity, thermal stability and stability in the wide oxygen partial pressure. Oxygen permeation rate was increased with temperature and increasing Ga rate.