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Bis(cyclopentadienyl)zirconium dichloride supported on zeolites for ethylene polymerization
Author(s) -
Marques Maria De Fátima V.,
Henriques Cristiane A.,
Monteiro José Luiz F.,
Menezes Sonia M. C.,
Coutinho Fernanda M. B.
Publication year - 1997
Publication title -
macromolecular chemistry and physics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.57
H-Index - 112
eISSN - 1521-3935
pISSN - 1022-1352
DOI - 10.1002/macp.1997.021981131
Subject(s) - cyclopentadienyl complex , ethylene , polyethylene , zirconium , polymerization , catalysis , zeolite , polymer chemistry , chemistry , polymer , aluminium , copolymer , propene , inorganic chemistry , organic chemistry
Y zeolites with different sodium contents and a sodium mordenite were evaluated as support for bis(cyclopentadienyl)zirconium dichloride as catalyst for ethylene polymerization. The results showed that, although the activities of the supported catalysts were lower than that of the homogeneous system, the average molecular weight of the polyethylene produced from the former was in general much higher than that of the polymer produced in solution. Contrary to the expected trend if the specific area was the dominant factor for catalyst activity, the best catalyst was the one supported on NaM zeolite. Thus, our results indicate that the concentration of framework aluminium atoms is the dominant factor, but that the contribution of the external surface is also important.