In this study, Ce 0.65 Zr 0.25 RE 0.1 O 2−δ (RE = Tb, Gd, Eu, Sm, Nd, Pr, and La) solid solutions were successfully prepared by the glycine-nitrate process and tested for CO oxidation activity. The X-ray diffraction results confirmed the formation of complete Ce 0.65 Zr 0.25 RE 0.1 O 2−δ solid solutions. The Raman spectroscopy measurements suggested the presence of oxygen vacancies due to defective structure formation and further evidenced the formation of solid solution. The high-resolution transmission electron microscopy observations showed the nanocrystalline nature of the solid solutions. From X-ray photoelectron spectroscopy analysis it was revealed that the cerium, terbium, and praseodymium are present in +3 and +4 oxidation states. The UV−vis diffuse reflectance spectroscopy indicated that the Pr 3+ ions in the Ce 0.65 Zr 0.25 Pr 0.1 O 2−δ system provoked a significant increase in the Ce 3+ fraction on the surface. H 2 temperature-programmed reduction measurements showed an enhanced surface reduction at much lower temperatures for Ce 0.65 Zr 0.25 Pr 0.1 O 2−δ sample compared to others, indicating increased oxygen mobility in these samples, which enable the enhanced oxygen diffusion at lower temperatures. Significantly high CO oxidation activity is exhibited by Ce 0.65 Zr 0.25 Pr 0.1 O 2 solid solution.

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