Heterogenization of metalorganic catalysts of olefin polymerization and evaluation of active site non-uniformity |
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| Authors: | Lyudmila Novokshonova Natalia Kovaleva Irina Meshkova Tatiana Ushakova Vadim Krasheninnikov Tatiana Ladygina Ilia Leipunskii Alexey Zhigach Michail Kuskov |
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| Affiliation: | 1. Institute of Chemical Physics, RAS, 119991 Moscow, Russia;2. Institute of Energy Problems of Chemical Physics, RAS, 119991 Moscow, Russia |
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| Abstract: | Heterogenized activators - “support-H2O/AlR3” (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-H2O/AlR3 is in general similar to the structure of commercial MAO. The heterogenization of Zr-cenes on support-H2O/AlR3 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. |
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| Keywords: | activator metallocene olefin polymerization support |
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