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Issue 6, 1997
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FTIR study of chromium carbonyl complexes onsilica–alumina: Active ethene polymerisationcatalysts


IR spectra are reported of [Cr(CO) 3 (η-C 6 H 6 )] and Cr(CO) 6 adsorbed on silica–alumina. The molecules were physically adsorbed, O-ligated to two types of Lewis-acidic Al 3+ site or underwent ligand loss to give sub-carbonyl species which were active as ethene polymerisation catalysts. Ligand loss was promoted by evacuation at 25°C, thermal ageing at 30–80°C, or exposure to ethene and involved retention of incompletely coordinated Cr on the surface. Contact with ethene gave highly linear polyethene chains. The efficiency of silica–alumina as a support for active catalysts is attributed to the high population of strongly Lewis-acidic surface sites.

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Article type: Paper
DOI: 10.1039/A606366G
J. Chem. Soc., Faraday Trans., 1997,93, 1205-1210

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    FTIR study of chromium carbonyl complexes on silica–alumina: Active ethene polymerisation catalysts

    G. Hunter, C. H. Rochester, A. G. Wilkinson and J. Paton, J. Chem. Soc., Faraday Trans., 1997, 93, 1205
    DOI: 10.1039/A606366G

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