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FTIR study of CO adsorption on coked Pt–Sn/Al2O3 catalysts

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Abstract

Infrared spectra of adsorbed CO have been used as a probe to monitor changes in Pt site character induced by the coking of Pt/Al2O3 and Pt–Sn/Al2O3 catalysts by heat treatment in heptane/hydrogen. Four distinguishable types of Pt site for the linear adsorption of CO on Pt/Al2O3 were poisoned to different extents showing the heterogeneity of the exposed Pt atoms. The lowest coordination Pt atoms (ν(CO) < 2030 cm−1) were unpoisoned whereas the highest coordination sites in large ensembles of Pt atoms (2080 cm−1) were highly poisoned, as were sites of intermediate coordination (2030–2060 cm−1). Sites in smaller two‐dimensional ensembles of Pt atoms (2060–2065 cm−1) were partially poisoned, as were sites for the adsorption of CO in a bridging configuration. The addition of Sn blocked the lowest coordination sites and destroyed large ensembles of Pt by a geometric dilution effect. The poisoning of other sites by coke was impeded by Sn, this effect being magnified for Cl‐containing catalyst. Oxidation or oxychlorination of coked catalyst at 823 K followed by reduction completely removed coke from the catalyst surfaces.

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Authors and Affiliations

  1. Chemistry Department, Dundee University, Dundee, DD1 4HN, UK

    Geomar J. Arteaga, James A. Anderson & Colin H. Rochester

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  1. Geomar J. Arteaga
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  2. James A. Anderson
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  3. Colin H. Rochester
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Arteaga, G.J., Anderson, J.A. & Rochester, C.H. FTIR study of CO adsorption on coked Pt–Sn/Al2O3 catalysts. Catalysis Letters 58, 189–194 (1999). https://doi.org/10.1023/A:1019023210896

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