RESUMO
Mn/Ce nano-composite oxides different amounts of manganese [5, 9, 17, 23, 29, 34 wt% as MnO[2]] were prepared by impregnation method at various calcinations temperatures. Effect of both thermal treatment and loading on the structural, surface and microstructure properties of the as prepared nano-composites was determined. The combined effect of manganese oxide and ceria, at different concentrations. Strongly influences the previous properties of the nano-composite oxides, by dispersing the MnO[2] phase and promoting the efficiency of the Ce[4+] - Ce[3+] and Mn[4+] - Mn[3+] redox couples. The thermal treatment and loading influences the interaction between manganese and CeO[2] evidently. The incorporation of Mn ions into CeO[2] cystal lattice resulted in weaker interaction between manganese and ceria on composite surface. Manganese loading at 400 [degree sign]C led to a slight increase in the ceria crystallite size which decreased by increasing the calcinations temperature from 400 to 600 [degree sign] C. The sintering activation energy of ceria was evaluated to be 12KJ/mol for the MnO[2]/Ce[O2] nano-composite