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Heterogenization of metalorganic catalysts of olefin polymerization and evaluation of active site non‐uniformity
Author(s) -
Novokshonova Lyudmila,
Kovaleva Natalia,
Meshkova Irina,
Ushakova Tatiana,
Krasheninnikov Vadim,
Ladygina Tatiana,
Leipunskii Ilia,
Zhigach Alexey,
Kuskov Michail
Publication year - 2004
Publication title -
macromolecular symposia
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.257
H-Index - 76
eISSN - 1521-3900
pISSN - 1022-1360
DOI - 10.1002/masy.200450915
Subject(s) - methylaluminoxane , catalysis , olefin fiber , polymerization , activation energy , propene , alkyl , montmorillonite , desorption , chemistry , zeolite , active site , polymer chemistry , materials science , metallocene , organic chemistry , adsorption , polymer
Heterogenized activators ‐ “support‐H 2 O/AlR 3 ” (where R=Me, iBu, support=montmorillonite, zeolite), synthesized directly on the support, form with metallocenes metal alkyl complexes highly active in olefin polymerization without the use of commercial methylaluminoxane (MAO). It was shown by the method of temperature programmed desorption with the application of mass‐spectrometry (TPD‐MS) that the aluminumorganic compound in support‐H 2 O/AlR 3 is in general similar to the structure of commercial MAO. The heterogenization of Zr‐cenes on support‐H 2 O/AlR 3 is accompanied by the appearance of the energy non‐uniformity of active sites. The activation energy of thermal destruction of active Zr‐C bonds in the active sites of prepared catalysts changes in the range from 25 to 32 kcal/mol.