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Vanadium and Chromium Catalysts for Polymerization of Ethylene
Author(s) -
HenriciOlivé G.,
Olivé S.
Publication year - 1971
Publication title -
angewandte chemie international edition in english
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 5.831
H-Index - 550
eISSN - 1521-3773
pISSN - 0570-0833
DOI - 10.1002/anie.197107761
Subject(s) - vanadium , chromium , polymerization , catalysis , homogeneous , polymer , ethylene , materials science , inorganic chemistry , polymer chemistry , chemistry , chemical engineering , organic chemistry , thermodynamics , physics , engineering
In the present progress report literature data concerning homogeneous catalyst systems based on vanadium and chromium are reviewed and complemented by a combined study of the magnetic properties and the polymerization activity of such systems. The results show that vanadium forms active species as V ( III ) and as V ( II ), but chromium only as Cr ( II ); models are suggested for the polymerization process. — A comparison with heterogeneous systems (Phillips catalyst) allows the establishment of some general principles concerning the activity of the catalyst and the properties of the polymers.