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EXAFS and DRIFTS study of lanthanide doped rhodium catalysts

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Abstract

The activity for the production of methane in the hydrogenation of carbon oxides has been measured over rare earth oxide (Ln = La, Ce, Sm, Yb, Lu) promoted Rh/Al2O3 catalysts in a fixed bed flow reactor at atmospheric pressure. The catalyst structures have been determined by EXAFS experiments at the K edge of the rhodium metal. From the EXAFS data it is concluded that the average coordination number of rhodium depends on the rare earth cation used as promoter. The Rh average coordination number follows the trend obtained from CO chemisorption data. The correlation of the activity results with the structural data demonstrates that the activity towards methane production decreases on increasing the metal dispersion, this being the main effect the promoter causes on the rhodium catalyst.

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Authors and Affiliations

  1. Departamento de Quimica Inorganica e Institute de Ciencia de Materiales de Sevilla, Centra Mixto Universidad de Sevilla-CSIC, PO Box 874, 41080, Sevilla, Spain

    P. Malet, J. J. Benitez, M. J. Capitan, M. A. Centeno, I. Carrizosa & J. A. Odriozola

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  1. P. Malet
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  2. J. J. Benitez
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  3. M. J. Capitan
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  4. M. A. Centeno
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  5. I. Carrizosa
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  6. J. A. Odriozola
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Malet, P., Benitez, J.J., Capitan, M.J. et al. EXAFS and DRIFTS study of lanthanide doped rhodium catalysts. Catal Lett 18, 81–97 (1993). https://doi.org/10.1007/BF00769501

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