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Aluminum containing dendrimeric silica nanoparticles as promising metallocene catalyst supports for ethylene polymerization
Publication . Cecílio, Duarte M.; Fernandes, Auguste; Lourenço, João P.; Ribeiro, M. Rosário
Several aluminum containing dendrimeric silica nanospheres,
DSAl materials, were prepared using different synthesis and
post-synthetic procedures. These materials were used for the
immobilization of Cp2ZrCl2 via direct impregnation. The support
materials were rigorously characterized by TEM, N2 adsorption,
FTIR (using pyridine as probe molecule) and SS-NMR to assess
their morphological, textural and surface acidic properties.
Supported catalysts were tested in ethylene homopolymerization
using methylaluminoxane (MAO) as co-catalyst and scavenger.
The relationships between the types and strength of acid
sites, as well as the textural and morphological parameters of
DSAl materials with the behavior of catalytic systems are
explored in this work. The results analyzed in this paper confirm
the importance that support surface acidity plays in the
formation of the active species for ethylene polymerization and
in its activity without neglecting the contribution of support
textural properties as well.
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Fundação para a Ciência e a Tecnologia
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SFRH
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SFRH/BPD/91397/2012