Ethylene polymerisation with zirconocene supported in Al-modified MCM-41: catalytic behaviour and polymer properties

Campos, João M.; Ribeiro, M. R.; Lourenço, J. P.; Fernandes, A.

http://hdl.handle.net/10400.1/2061

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Abstract(s)

Heterogeneous olefin polymerisation catalysts were prepared by combining zirconocene with a series of purely siliceous and Al-containingMCM- 41 supports with different Si/Al ratios, using simplified and improved versions of the well-known direct impregnation and “MAO pre-treatment” methods. The catalysts were tested in ethylene polymerisation. Analysis of polymerisation activities and kinetic profiles led to a rationalisation on the effect of support Si/Al ratios and methods used for catalyst preparation over the catalytic behaviour for ethylene polymerisations. Polymers were characterised by scanning electron microscopy and differential scanning calorimetry. A mechanism is proposed to associate the formation or absence of fibrous morphology with polymerisation activities.

Keywords

Zirconocene Nanofibres Ethylene polimerisation Supported catalyst MCM-41

URI

http://hdl.handle.net/10400.1/2061

Citation

Campos, J. M.; Ribeiro, M. R.; Lourenço, J. P.; Fernandes, A. Ethylene polymerisation with zirconocene supported in Al-modified MCM-41: catalytic behaviour and polymer properties, Journal of Molecular Catalysis A: Chemical, 277, 93-101, 2007.