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Investigation of physicochemical properties and catalytic activity of nanostructured Ce0.7M0.3O2−δ (M = Mn, Fe, Co) solid solutions for CO oxidation

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Abstract

In this work, nanosized Ce0.7M0.3O2−δ (M = Mn, Fe, Co) solid solutions were prepared by a facile coprecipitation method and evaluated for CO oxidation. The physicochemical properties of the synthesized samples were investigated by various characterization techniques, namely, XRD, ICP-OES, BET surface area, SEM-EDX, TEM and HRTEM, Raman, XPS, and H2-TPR. XRD studies confirmed the formation of nanocrystalline single phase Ce0.7M0.3O2−δ solid solutions. ICP-OES analysis confirmed actual amount of metal loadings in the respective catalysts. The BET surface area of Ce0.7M0.3O2−δ samples significantly enhanced after the incorporation of dopants. TEM studies confirmed nanosized nature of the samples and the average particle sizes of Ce0.7M0.3O2−δ were found to be in the range of ∼8–16 nm. Raman studies indicated that the incorporation of dopant ions into the CeO2 lattice promote the formation of more oxygen vacancies. The existence of oxygen vacancies and different oxidation states (Ce3+/Ce4+ and Mn2+/Mn3+, Fe2+/ Fe3+, and Co2+/Co3+) in the doped CeO2 samples were further confirmed from XPS investigation. TPR measurements revealed an enhanced reducibility of ceria after the incorporation of dopants. The catalytic activity results indicated that the doped CeO2 samples show excellent CO oxidation activity and the order of activity was found to be Ce0.7Mn0.3O2−δ > Ce0.7Fe0.3O2−δ > Ce0.7Co0.3O2−δ > CeO2. The superior CO oxidation performance of CeO2-MnOx has been attributed to a unique Ce-Mn synergistic interaction, which facilitates materials with promoted redox properties and improved oxidation activity.

The presence of structural oxygen vacancies, low temperature reducibility and synergetic interaction between Ce−O and Mn−O oxides were responsible for superior CO oxidation performance of Ce−Mn−O nano oxide compared to pure CeO2, Ce−Fe−O and Ce−Co−O samples.

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Acknowledgements

We greatly acknowledge Prof. Dr. W. Grünert, Ruhr University Bochum, Germany for providing CO oxidation results. PV thanks Council of Scientific and Industrial Research (CSIR), New Delhi for the Senior Research Fellowship. DJ thanks IICT-RMIT Joint Research Centre for the award of Junior Research Fellowship. Financial support was received from the Department of Science and Technology, New Delhi, under SERB Scheme (SB/S1/PC-106/2012).

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Authors and Affiliations

  1. Inorganic and Physical Chemistry Division, CSIR–Indian Institute of Chemical Technology, Uppal Road, Hyderabad, 500 007, India

    P VENKATASWAMY, D JAMPAIAH & BENJARAM M REDDY

  2. R&D Division, Sud–Chemie India Pvt. Limited, Binanipuram, Kerala, 683 502, India

    C U ANIZ

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  1. P VENKATASWAMY
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  2. D JAMPAIAH
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  3. C U ANIZ
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  4. BENJARAM M REDDY
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Correspondence to BENJARAM M REDDY.

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Supplementary Information

Detailed information about the Williamson-Holl (We-H) plots, CO oxidation profile, calculation of crystallite size using Debye-Scherrer equation, chemical composition by ICP-OES analysis, surface reduction temperatures, and characteristic temperatures of CO oxidation of all the investigated catalysts calcined at 773 K are available at www.ias.ac.in/chemsci.

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VENKATASWAMY, P., JAMPAIAH, D., ANIZ, C.U. et al. Investigation of physicochemical properties and catalytic activity of nanostructured Ce0.7M0.3O2−δ (M = Mn, Fe, Co) solid solutions for CO oxidation. J Chem Sci 127, 1347–1360 (2015). https://doi.org/10.1007/s12039-015-0897-8

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  • DOI: https://doi.org/10.1007/s12039-015-0897-8

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