AMO3 perovskite-related compounds represent probably one of the most studied types of mixed oxides in the field of heterogeneous catalysis. The extraordinary compositional flexibility of the perovskite structure allows tailoring the oxidation state and the M-cation environment to modulate their catalytic performance. They are considered an alternative to replace noble metals in several catalytic formulations with potential application in a variety of reactions, most of them redox processes. CO oxidation is an example of an important environmental protection process, as well as a model reaction to study catalyst mechanisms.