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Doping of lanthanum cobaltite by Mn: thermal, magnetic, and catalytic effect

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Abstract

Great differences in crystallographic phases, magnetic properties, and catalytic activity were detected in lanthanum cobaltite and cobaltite modified with the insertion of 10 wt.% of Mn. Atomic absorption spectroscopy, BET area measurements, XRD analysis, TPR, and FT-IR suggest that the total insertion of manganese in the LaCoO3 structure is successful. Thermal stability is reached for LaCo0.90Mn0.10O3 up to 973 K without loss of the perovskite structure. The magnetic properties of the as-grown compounds are maintained after a first reduction process up to 723–773 K, while presence of segregated phases is observed after reduction at 973 K. The catalytic activity evaluated in the total combustion of acetyl acetate shows a decrease in the ignition temperature, i.e. an increase in the catalytic activity for the LaCo0.90Mn0.10O3 perovskite. A significant enhancement in the catalytic activity expressed as intrinsic activity, mol m−2 h−1, with the manganese substitution was found.

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Acknowledgement

The authors thank CONICYT (Fondecyt Grant 1060702).

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Authors and Affiliations

  1. Facultad de Ciencias Químicas, Universidad de Concepción, Casilla 160-C, Concepcion, Chile

    Gina Pecchi, Claudia Campos, M. Graciela Jiliberto & Yanko Moreno

  2. Sciences Chimiques de Rennes, UMR 6226, CNRS, Université de Rennes 1, 35042, Rennes Cedex, France

    Octavio Peña

Authors
  1. Gina Pecchi
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  2. Claudia Campos
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  3. M. Graciela Jiliberto
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  4. Yanko Moreno
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Correspondence to Gina Pecchi.

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Pecchi, G., Campos, C., Jiliberto, M.G. et al. Doping of lanthanum cobaltite by Mn: thermal, magnetic, and catalytic effect. J Mater Sci 43, 5282–5290 (2008). https://doi.org/10.1007/s10853-008-2790-z

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  • DOI: https://doi.org/10.1007/s10853-008-2790-z

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