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Nanosized CeO2–Gd2O3 Mixed Oxides: Study of Structural Characterization and Catalytic CO Oxidation Activity

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Abstract

Ceria is an important rare earth metal oxide for numerous catalytic applications. In the present work, a combined study of structural characterization and catalytic activity of nanocrystalline Ce–Gd–O mixed oxides was thoroughly investigated towards CO oxidation. The Ce–Gd mixed oxides with different Gd-doping amounts (10 and 20 mol% Gd with respect to Ce) were prepared by means of an economical and simple coprecipitation method with aqueous NH3 solution as the precipitant. The resulting samples were treated at different calcination temperatures to evaluate their structural homogeneity and thermal stability. An extensive physicochemical characterization was done by means of XRD, Raman, TEM, BET analysis, H2-TPR, XPS, and UV–Vis DRS techniques. XRD studies revealed the formation of nanocrystalline single phase Ce–Gd solid solutions. Raman studies further disclosed the formation of Ce–Gd solid solutions associated with deformed F2g band and additional bands pertaining to oxygen vacancy defects. The Gd-doping remarkably reduced the CeO2 crystallite size, which is in nanoscale range as evidenced by TEM images. The BET surface area and oxygen vacancy defects of CeO2 were significantly enhanced after Gd3+ incorporation. The ability of CeO2 to store and release of oxygen (oxygen storage capacity, OSC) is markedly improved 3 and 4 times for Ce0.9Gd0.1O2−δ and Ce0.8Gd0.2O2−δ samples, respectively. Among the investigated catalysts, the Ce0.8Gd0.2O2−δ sample calcined at 773 K showed better catalytic activity due to smaller crystallite size, higher BET surface area, enhanced reducible nature, and superior OSC. It is found that the catalytic performance of the Ce–Gd sample strongly depends on the Gd-loading and calcination temperature.

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Acknowledgments

We greatly acknowledge Prof. Dr. W. Grünert, RUB, Germany for providing CO oxidation results. D.N.D., T.V. and P.S. thank the Council of Scientific and Industrial Research (CSIR), New Delhi for research fellowships. Financial support was received from Department of Science and Technology (SB/S1/PC-106/2012), New Delhi.

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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

    D. Naga Durgasri, T. Vinodkumar, Putla Sudarsanam & Benjaram M. Reddy

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  1. D. Naga Durgasri
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  2. T. Vinodkumar
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  3. Putla Sudarsanam
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  4. Benjaram M. Reddy
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Correspondence to Benjaram M. Reddy.

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Durgasri, D.N., Vinodkumar, T., Sudarsanam, P. et al. Nanosized CeO2–Gd2O3 Mixed Oxides: Study of Structural Characterization and Catalytic CO Oxidation Activity. Catal Lett 144, 971–979 (2014). https://doi.org/10.1007/s10562-014-1223-7

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  • DOI: https://doi.org/10.1007/s10562-014-1223-7

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