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K. Czaja, L. Korach, M. Białek


Synthesis of oxide-supported vanadium catalysts and their activity in ethylene polymerization.

RAPID COMMUNICATION (in English)

Polimery 1999, No 6, 426


DOI: dx.doi.org/10.14314/polimery.1999.426


Summary

The activity of oxide-supported vanadium-based catalyst systems (VOCl3/Et2AlCl) in low-pressure ethylene polymerization and the properties of the resulting polyethylenes were studied in relation to the type and mode of modification of the oxide support. Alumina, silica and an unconventional silica-type material prepared by the sol-gel process were used as supports. Results are compared with those obtained earlier with a catalyst supported on MgCl2(THF)2. Of the oxides studied, the silica-type sol-gel material dehydrated and subsequently modified with Et2AlCl proved to be the best carrier for a vanadium catalyst. The polyethylene prepared by using this catalyst support was found to exhibit good morphology, especially as compared with the polymer prepared over the more active Mg-V-Al catalyst.


Keywords: sol-gel process, sol-gel silica-type carrier, oxide support, vanadium catalyst, polymerization of ethylene

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