Patent ID: 8974764
Filing Date: 2015-03-10
Classification: B01J,B82Y,C01G,C01P,C04B,Y02C

Abstract:
1. A process for the preparation of a calcined composition comprising a perovskite having formula LaMO a support based on alumina or aluminum oxyhydroxide, that has been precalcined at a temperature between greater than 500° C. and less than 700° C., and optionally a substituent element partially substituting at least one of the elements La and M of the perovskite, wherein the perovskite particles are dispersed over the support, and wherein, after calcination at 700° C. for 4 hours, the perovskite exists in the form of a pure crystallographic phase and the perovskite particles have a size of at most 15 nm, wherein the process comprises: forming a liquid medium comprising: adding a base to the medium thus formed until a pH of at least 9 is obtained, thereby forming a precipitate; separating the precipitate from the medium; and calcining the precipitate to obtain the composition.