Synthesis and Characterization of Perovskite-Type Oxides La1−xMxCoO3 (M = Ce, Sr) for the Selective CO Oxidation (SELOX)

Perovskite-type oxides La1−xMxCoO3 (M = Ce, Sr) were prepared by citrate method, characterized and evaluated in the selective CO oxidation (SELOX-CO). The insertion of low Cerium or Strontium content generated solids with a single phase related LaCoO3 perovskite. For higher contents we observed segregation of CeO2 and SrCO3. The iso-structural substitution favors the formation of vacancies. The SELOX-CO showed 100 % CO conversion at 200 °C. Higher temperatures favored hydrogen oxidation and methanation.