Subjects: Materials Science >> Materials Science (General) submitted time 2023-03-18 Cooperative journals: 《材料研究学报》
Abstract： Powders of ceria-zirconia solid solution were prepared by using different molar ratio of Ce (NO3)4�6H2O and Zr(NO3)4�5H2O as raw materials and appropriate additives of C3H5NO, C7H10N2O2 and (NH4)2S2O8 as polymer -net gel. The influence of the polymer-net gel on the preparation process and the effect of Ce/Zr ratio on the properties of the powders of ceria-zirconia solid solution were investigated respectively. The results show that the additives of polymer are beneficial not only to the separation of the particulates of ceria-zirconia solid solution due to the formation of a three-dimensional network of the polymer-net gel, but also to the formation of nanoporous powders of ceria-zirconia solid solution due to the burn away of polymer during the subsequent calcinations. The powders of ceria- zirconia solid solution with particle size 10-20 nm could be prepared when the mass ratio of C3H5NO and C7H10N2O2 was 5: 1, the dissolvability of mixed solute was 0.04 mol/L and an appropriate heat treatment process was adopted. XRD analysis revealed that the ceria-zirconia solid solutions with molar ratio of Ce/Zr in a range of 3:7-5: 5 present tetragonal crystallographic structure, while those in a range of 6: 4-7: 3 present cubic structure respectively; their lattice constant decreased with the increasing Zr+ content. N2 adsorption isotherm showed that the ceria- zirconia solid solution with Ce/Zr molar ratio of 6: 4 exhibited excellent features:specific surface area of 120 m2穏- 1; aperture of 8.12 nm; pore volume of 0.22 cm3/g. SEM images showed that the ceria-zirconia solid solution powders have an alveolate-like network structure.
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