Investigation of structure and morphology of Cu-Mn-Zr-Ce-O solid solutions

Materials based on ceria are of interest due to the fact that they have a large oxygen storage capacity and high mobility of oxygen, which can offer high catalytic activity and electrical conductivity. It is well known that the copper or manganese doping of ceria leads to a synergistic effect - a decrease in temperature of the catalytic reaction and the activation energy, but, unfortunately, the solid solutions Cu-Mn-(Zr)-Ce-O could not be presented earlier. So, a series of Cu-Mn-Zr-Ce-O solid solutions was synthesized by co-precipitation method with sonication. The crystallite size of all samples is about 7-9 nm, and did not depend on the Cu/Mn ratio. The variation in the lattice parameter corresponds to the Vegard's law and can be described by the semiempirical equation for ceria based solid solutions: Cu-Mn-Ce-O is clear correlated to the equation, but Cu-Mn-Zr-Ce-O is not. Pore size distributions in the range of 2-25 nm for Cu-Mn-Ce-O systems and 2-40 nm for Cu-Mn-Zr-Ce-O systems were observed. Thereby the preparing of homogeneous solid solutions gives the better textural property, thermal stability, catalytic properties and others compared to domain- or phase-segregated nonhomogeneous ones. Therefore, this method allowed creating such homogeneous solid solutions, giving the better properties for their application. These systems can be applied in catalysis as a support or in IT-SOFC as an electrolyte.

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