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Ethylene polymerisation with zirconocene supported in Al-modified MCM-41: catalytic behaviour and polymer properties
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Orientador(es)
Resumo(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.
Descrição
Palavras-chave
Zirconocene Nanofibres Ethylene polimerisation Supported catalyst MCM-41
Contexto Educativo
Citação
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.