Abstract:
Perovskite-type oxides have shown excellent catalytic properties, especially in the depollution of exhaust gases. These solids have a well-defined but also highly flexible crystalline structure represented by the general formula ABO3, where A: a cation of rare-earth, alkaline earth, alkali or ions with a large ionic radius and B a transition metal cation. By partial substitutions on A- and/or B-sites is possible a large variety of compounds with different compositions and features i.e. hosting of B cations in mixed oxidation states, generation of structural defects and oxygen vacancies. Such wide compositional flexibility is of great importance for heterogeneous catalysis as it is responsible for hard modifications of the catalytic properties of the material including the dissociative properties over NOx.
