Comparative Study on Synthesis and Characterization of Ceria Based Composite Oxides Containing Manganese Nano-Particles | ||||
| Egyptian Journal of Chemistry | ||||
| Article 4, Volume 53, Issue 1, February 2010, Page 61-76 PDF (685.54 K) | ||||
| DOI: 10.21608/ejchem.2010.1204 | ||||
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| Abstract | ||||
| Mn/Ce nano-composite oxides containing different amounts of manganese (5, 9, 17, 23, 29, 34 wt% as MnO2) were prepared by impregnation method at various calcination 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 MnO2 phase and promoting the efficiency of the Ce4+- Ce3+ and Mn4+ - Mn3+ redox couples. The thermal treatment and loading influenced the interaction between manganese and CeO 2 evidently. The incorporation of Mn ions into CeO2 crystal lattice resulted in weaker interaction between manganese and ceria on composite surface. Manganese loading at 400oC led to a slight increase in the ceria crystallite size which decreased by increasing the calcination temperature from 400 to 600oC. The sintering activation energy of ceria was evaluated to be 12kJ/mol for the MnO2/CeO2 nano-composite. | ||||
| Keywords | ||||
| XRD; TEM; SBET and MnO2/CeO2 nano-composite | ||||
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