Analyse par DRX et MET de l'evolution de la solution solide LaNi_xFe_(1-x)O_3 et de la segregation de nickel dans les conditions d'obtention du gaz de synthese par oxydation partielle du methane

摘要

Mixed perovskite oxides of LaNi_xFe_(1-x)O_3 (O ≤ x ≤ 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 system. The studies of the phase obtained after catalytic test permit to control the migration of a part of nickel and its possible redispersion under oxidative treatment of trimetallic structures with values of x lower than x = 0.4.