info:eu-repo/semantics/article
Surface nickel particles generated by exsolution from a perovskite structure
Fecha
2019-02Registro en:
Aguero, Fabiola Nerina; Beltrán, Ana M.; Fernández, María Asunción; Cadus, Luis Eduardo; Surface nickel particles generated by exsolution from a perovskite structure; Academic Press Inc Elsevier Science; Journal of Solid State Chemistry; 273; 2-2019; 75-80
0022-4596
CONICET Digital
CONICET
Autor
Aguero, Fabiola Nerina
Beltrán, Ana M.
Fernández, María Asunción
Cadus, Luis Eduardo
Resumen
LaAl 1-x Ni x O 3 (with x = 0.05 and 0.2) perovskite oxides were successfully synthesized and its behavior under reduction atmosphere was studied. HRTEM and STEM studies, coupled to HAADF and EDX detection, allowed to evidence the Ni exsolution process to the surface of the solid and to build nano-catalytic centers. The size of these centers is independent of the reduction conditions in the range studied. The high specific surface of the raw material, its porosity and the structure defects could be responsible of the low temperature at which the exsolution process starts. The content of Ni dopants allows the control of Ni centers size on the surface and the synthesis method provides Ni-nanoparticles strongly anchored to the resultant support.