Analyse par DRX et MET de l'évolution de la solution solide LaNi_xFe_1-xO₃ et de la ségrégation de nickel dans les conditions d'obtention du gaz de synthèse par oxydation partielle du méthane

Mixed perovskite oxides of LaNixFe1-xO3 (0 less than or equal to x less than or equal to 1) have been prepared by sol-gel like method and evaluated as catalysts for the partial oxidation of methane into synthesis gas without previous hydrogen treatment. The XRD and TEM analysis show the formation of a solid solution and the high homogeneity of the systems. The studies of the phases obtained after catalytic test permit to control the migration of a pad of nickel and its possible redispersion under oxidative treatment for trimetallic structures with values of x lower than x=0.4.