RARE EARTH PEROVSKITE COLLOIDAL DISPERSION AND METHOD FOR THE PRODUCTION THEREOF

摘要

The invention relates to a colloidal dispersion of a rare earth perovskite structured compound of formula LnBO3 (1) wherein Ln is at least one rare earth other than une cerium alone and B is at least one element selected from the group including elements whose atomic number is 22 -31, 40 - 51, 73 - 83 and aluminium. The dispersion is obtained by reacting a perovskite of formula (1), exhibiting elementary crystallites of a maximum of 500 nm with a monovalent acid having a pka ranging between 2.5 and 5.0; heating the mixture obtained at a temperature of 50 DEG C and 200 DEG C; and purification, if necessary, of the reactional medium thus obtained. The dispersion according to the invention can be used in the production of catalysts.