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Low-temperature CO oxidation over manganese, cobalt, and nickel doped CeO₂ nanorods

Jampaiah, Deshetti, Venkataswamy, P., Coyle, Victoria Elizabeth, Reddy, Benjaram M., Bhargava, Suresh K.
RSC advances 2016 v.6 no.84 pp. 80541-80548
Raman spectroscopy, X-ray diffraction, X-ray photoelectron spectroscopy, active sites, carbon monoxide, catalysts, catalytic activity, ceric oxide, cerium, cobalt, energy-dispersive X-ray analysis, hot water treatment, ions, manganese, nanorods, nickel, oxidation, oxygen, scanning electron microscopy, surface area, surface roughness, transmission electron microscopy
Surface active sites such as oxygen vacancies, Ce³⁺ ions, and unsaturated coordinated sites on nano ceria (CeO₂) are significant in catalytic oxidation reactions. The recent development in nanoengineered CeO₂ made a pathway to extend its use in various catalytic applications. In this study, transition metals (Mn²⁺, Ni²⁺, and Co²⁺) doped CeO₂ 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 H₂-TPR. The results demonstrated that the incorporation of dopants greatly enhances the surface defective sites (Ce³⁺ ions and a high degree of surface roughness) and redox properties of CeO₂ NRs and thereby improved catalytic activity. Especially, the Co–CeO₂ NR catalyst exhibited better CO conversion (T₅₀ ∼ 145 °C) when compared to pure CeO₂ NR (T₅₀ ∼ 312 °C).