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Issue 9, 2011
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Structural characteristics and catalytic performance of alumina-supported nanosized ceria–lanthana solid solutions

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Abstract

Alumina-supported nanosized ceria–lanthana solid solutions (CeO2−La2O3/Al2O3 (CLA) = 80 : 20 : 100 mol% based on oxides) were synthesized by a modified deposition coprecipitation method from ultra-high dilute aqueous solutions. The synthesized materials were subjected to various calcination temperatures from 773 to 1073 K to understand the surface structure and the thermal stability. Structural and redox properties were deeply investigated by different characterization techniques, namely, X-ray diffraction (XRD), Raman spectroscopy (RS), transmission electron microscopy (TEM), UV-visible diffuse reflectance spectroscopy (UV-vis DRS), X-ray photoelectron spectroscopy (XPS), temperature programmed reduction (H2-TPR), and Brunauer–Emmett–Teller (BET) surface area. The catalytic efficiency was evaluated for CO oxidation at normal atmospheric pressure. BET surface area measurements revealed that synthesized samples exhibit reasonably high specific surface area. As revealed by XRD measurements, samples maintain structural integrity up to 1073 K without any disproportionation of phases. XPS results suggested that there is no significant change in the Ce3+ amount during thermal treatments due to the absence of undesirable cerium aluminate formation. A significant number of oxygen vacancies were confirmed from Raman and UV-vis DRS measurements. The CLA 773 sample exhibited superior CO oxidation activity. The better activity of the catalyst was proved to be due to a high dispersion in the form of nanosized ceria–lanthana solid solutions over the alumina support, facile reduction, and a high oxygen storage capacity.

Graphical abstract: Structural characteristics and catalytic performance of alumina-supported nanosized ceria–lanthana solid solutions

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Publication details

The article was received on 09 Aug 2011, accepted on 10 Sep 2011 and first published on 14 Oct 2011


Article type: Paper
DOI: 10.1039/C1CY00312G
Citation: Catal. Sci. Technol., 2011,1, 1645-1652

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    Structural characteristics and catalytic performance of alumina-supported nanosized ceria–lanthana solid solutions

    L. Katta, G. Thrimurthulu, B. M. Reddy, M. Muhler and W. Grünert, Catal. Sci. Technol., 2011, 1, 1645
    DOI: 10.1039/C1CY00312G

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