Lanthanum-Based Perovskite-Type Oxides La_1−xCe_xBO₃ (B = Mn and Co) as Catalysts: Synthesis and Characterization

Table 4

H₂ consumed for the first step and second step of reduction on and (x = 0, 0.2, and 0.4) perovskite catalysts.

Catalyst; composition	First step of reduction	Reduction; temperature (°C)	Second step of reduction	Reduction; temperature (°C)
LaCoO3	Co^3+ to Co^2+	391 (surface) 548 (bulk)	Co^2+ to Co^0	648
La0.8Ce0.2CoO3		413		575
La0.6Ce0.4CoO3		427 (surface) 508 (bulk)		616
LaMnO3	Mn^4+ to Mn^3+	542	Mn^3+ to Mn^2+	798
La0.8Ce0.2MnO3	Mn^4+ to Mn^3+	571	Mn^3+ to Mn^2+	798