Utilize este identificador para referenciar este registo: http://hdl.handle.net/10400.1/2061
Título: Ethylene polymerisation with zirconocene supported in Al-modified MCM-41: catalytic behaviour and polymer properties
Autor: Campos, João M.
Ribeiro, M. R.
Lourenço, J. P.
Fernandes, A.
Palavras-chave: Zirconocene
Nanofibres
Ethylene polimerisation
Supported catalyst
MCM-41
Data: 2007
Editora: Elsevier
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.
Resumo: 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.
Peer review: yes
URI: http://hdl.handle.net/10400.1/2061
ISSN: 1381-1169
Aparece nas colecções:FCT2-Artigos (em revistas ou actas indexadas)

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