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In situ EXAFS studies of modifications to supported metallic catalysts under reactive atmospheres

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Abstract

Extended X-ray absorption fine structure (EXAFS) spectroscopy has been used to study the structural evolution of monometallic (Pt/Al2O3) and bimetallic (Pt-Re/Al2O3) catalysts with metal loadings representative of those used industrially under conditions close to those seen during preparation (calcination and reduction), during catalysis (under a hydrogen-hydrocarbon mixture), and during regeneration (simulated by cycles of reduction and oxidation). During the catalytic reforming ofn-heptane, the formation of bonds to carbon species is observed directly by EXAFS. Despite the fact that only platinum-carbon bonds are observed, bimetallic systems show significant differences compared with monometallic systems with, in the case of Pt-Re, a reduction in the temperature range over which carbon bonding is observed, and structural modifications of the metallic particles. Under the same conditions, no carbon bonding is observed for the Pt-Sn system. In the case of Pt-Sn/Al2O3, the EXAFS results, confirmed by transmission electron microscopy, demonstrate the high resistance to sintering of this bimetallic system compared to the monometallic system.

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Authors and Affiliations

  1. Bat. 209C Université Paris-Sud, LURE, 91405, Orsay Cedex, France

    A. Caballero, F. Villain & H. Dexpert

  2. IFP, 1&4 Ave. de Bois Preau, 92500, Rueil Malmaison, France

    F. Lepeltier, B. Didillon & J. Lynch

Authors
  1. A. Caballero
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  2. F. Villain
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  3. H. Dexpert
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  4. F. Lepeltier
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  5. B. Didillon
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  6. J. Lynch
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Caballero, A., Villain, F., Dexpert, H. et al. In situ EXAFS studies of modifications to supported metallic catalysts under reactive atmospheres. Catal Lett 20, 1–13 (1993). https://doi.org/10.1007/BF00772592

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