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An in situ Mössbauer spectroscopic investigation of the hydrogen pretreatment of titania-supported iron-iridium catalysts

  • Surface Phenomena, Catalysis, Corrosion
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Abstract

The effects of pretreatment in hydrogen of some titania-supported iron-iridium catalysts have been examined in situ by57Fe Mössbauer spectroscopy. The Fe3+ in the supported phase which is formed during the initial preparation of the catalyst in air undergoes partial reduction to Fe2+ when treated in hydrogen at low temperatures. Further treatment in hydrogen at moderate temperatures results in some of the Fe2+ being oxidised to Fe3+ which, on further exposure to hydrogen at elevated temperatures, is predominantly reduced to Fe0 in an iron-iridium alloy. The extent of the anaerobic oxidation is optimised in materials with an iron: noble metal mole ratio of ca. 1∶2.5 when supported on high surface area titania by a preparation involving slow initial drying of the catalyst in air at low temperatures and subsequent treatment in hydrogen at ca. 400°C. The results are associated with metal-metal and metal-support interactions which result from the preparative procedure.

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Authors and Affiliations

  1. School of Chemistry, University of Birmingham, P.O. Box 363, B15 2TT, Birmingham, UK

    Frank J. Berry & Simon Jobson

  2. Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian, Peoples Republic of China

    Xu Changhai

Authors
  1. Frank J. Berry
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  2. Xu Changhai
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  3. Simon Jobson
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Berry, F.J., Changhai, X. & Jobson, S. An in situ Mössbauer spectroscopic investigation of the hydrogen pretreatment of titania-supported iron-iridium catalysts. Hyperfine Interact 57, 1759–1763 (1990). https://doi.org/10.1007/BF02405718

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  • DOI: https://doi.org/10.1007/BF02405718

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