Surface active sites such as oxygen vacancies, Ce ~(3+) ions, and unsaturated coordinated sites on nano ceria (CeO _(2) ) are significant in catalytic oxidation reactions. The recent development in nanoengineered CeO _(2) made a pathway to extend its use in various catalytic applications. In this study, transition metals (Mn ~(2+) , Ni ~(2+) , and Co ~(2+) ) doped CeO _(2) nanorods (NRs) were prepared by hydrothermal method and tested towards CO oxidation. Furthermore, the samples were characterized by various physicochemical techniques, namely, TEM and HR-TEM, SEM-EDX, XRD, ICP-OES, BET surface area, Raman spectroscopy, XPS, and H _(2) -TPR. The results demonstrated that the incorporation of dopants greatly enhances the surface defective sites (Ce ~(3+) ions and a high degree of surface roughness) and redox properties of CeO _(2) NRs and thereby improved catalytic activity. Especially, the Co–CeO _(2) NR catalyst exhibited better CO conversion ( T _(50) ～ 145 °C) when compared to pure CeO _(2) NR ( T _(50) ～ 312 °C).
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