Nonstoichiometry, thermal stability and reactivity in static H_2 atmosphere of partially substituted perovskite-type LaCoO_3 mixed oxides were investigated by means of TPR and X-ray diffraction. The XRD and TPR analysis showed hexagonal structures of ...
Nonstoichiometry, thermal stability and reactivity in static H_2 atmosphere of partially substituted perovskite-type LaCoO_3 mixed oxides were investigated by means of TPR and X-ray diffraction. The XRD and TPR analysis showed hexagonal structures of single phase perovskite.
LaCoO_(3.0) a=5.436, c=13.095; La_(0.9)Sr_(0.1)CoO_(3.0) a=5.445, c=13.126; LaCo_(0.9)Cu_(0.1)O_(3.0) a=5.445, c=13.119; La_(0.9)Sr_(0.1)Co_(0.9)Cu_(0.1)O_(3.0) a=5.455, c=13.158.
The reduction reaction of unsubstituted LaCoO_3 were two stages but each site substituted oxides showed three stage reaction. This means that the last reduction stages were induced by substituents(Sr, Cu). According to the kinetic analysis for the first reduction stages, B-site substituted LaCo_(0.9)Cu_(0.1)O_3 showed the lowest activation energy.