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Infrared spectroscopy and microcalorimetry studies of CO adsorption on sulfated zirconia supported platinum catalysts

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Abstract

Carbon monoxide adsorption has been investigated on Pt particles supported on a high surface area zirconia and sulfated zirconias. The accessibility of the Pt surface determined from the comparison of H2 chemisorption and transmission electron microscopy depends on two parameters: the temperature of treatment in air used to dehydroxylate sulfated zirconia, and the temperature of reduction. An oxidative pretreatment at 823 K yields a poor accessibility of Pt (0.03 < H/Pt < 0.05) whatever the temperature of reduction, whereas a Pt dispersion of 0.6 can be obtained by oxidation at 673 K followed by a mild reduction at 473 K. FTIR spectroscopy of adsorbed CO on Pt/ZrO2 shows besides the normal linear species at 2065 cm−1, a band at 1650 cm−1 which is attributed to CO bridged between Pt and Zr atoms. On Pt/ZrO2-SO 2−4 , all bridged species tend to disappear, as well as the dipole-dipole coupling andv CO is shifted by 57 cm−1 to higher frequencies. These results are attributed to sulfur adsorption on Pt which decreases the electron back-donation from Pt to the 2π * antibonding orbital of CO. The lower initial heat of CO adsorption observed on Pt/ZrO2-SO4/2− supports this proposal.

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Author notes

  1. François Figuéras

    Present address: Institut de Recherche sur la Catalyse, 2 Avenue A. Einstein, 69626, Villeurbanne, France

Authors and Affiliations

  1. Laboratoire de Matériaux Catalytiques et Catalyse en Chimie Organique, URA 418 du CNRS, 8 rue de l'Ecole Normale, 34053, Montpellier Cedex 1, France

    Bernard Coq, Christian Walter & François Figuéras

  2. Department of Chemistry, University of Edinburgh, West Mains Road, EPH 3JJ, Edinburgh, UK

    Ronald Brown & Gordon McDougall

Authors
  1. Bernard Coq
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  2. Christian Walter
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  3. Ronald Brown
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  4. Gordon McDougall
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  5. François Figuéras
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Coq, B., Walter, C., Brown, R. et al. Infrared spectroscopy and microcalorimetry studies of CO adsorption on sulfated zirconia supported platinum catalysts. Catal Lett 39, 197–203 (1996). https://doi.org/10.1007/BF00805583

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  • DOI: https://doi.org/10.1007/BF00805583

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