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Stabilisation of cationic iridium hydrogenation catalysts via intercalation in montmorillonite clay

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Abstract

The olefin hydrogenation catalysts [Ir(COD)(PPh3)2]+ and [Ir(COD)(NCMe)(PCy3)]+ have been intercalated in montmorillonite clay via an ion-exchange procedure. While the initial activity of the intercalated catalysts for the hydrogenation of cyclohexene is generally 50–80% of that of their homogeneous analogues, the intercalated catalysts remain active for longer periods, indicating that dimer- and trimer-forming reactions, responsible for deactivation of the homogeneous catalysts, are partially suppressed upon intercalation. In the hydrogenation of 1-hexene the activity of [Ir(COD)(NCMe)(PCy3)][BPh4] for the competing process of double bond isomerisation is found to increase with the catalyst concentration.

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Authors and Affiliations

  1. Koninklijke/Shell-Laboratorium, Amsterdam (Shell Research B.V.), PO Box 3003, 1003, AA Amsterdam, The Netherlands

    M. Crocket & R. H. M. Herold

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  1. M. Crocket
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  2. R. H. M. Herold
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Crocket, M., Herold, R.H.M. Stabilisation of cationic iridium hydrogenation catalysts via intercalation in montmorillonite clay. Catal Lett 18, 243–251 (1993). https://doi.org/10.1007/BF00769443

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  • DOI: https://doi.org/10.1007/BF00769443

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