Titanium-magnesium catalysts for olefin polymerization - effect of titanium oxidation state on catalyst performance

T. B. Mikenas; A. A. Tregubov; V. A. Zakharov; L. G. Echevskaya; M. A. Matsko

Published : 2022-08-23

Vol. 53 No. 5 (2008)

Titanium-magnesium catalysts for olefin polymerization - effect of titanium oxidation state on catalyst performance

T. B. Mikenas A. A. Tregubov V. A. Zakharov L. G. Echevskaya M. A. Matsko

Abstract

In this work, we investigated the influence of oxidation state of titanium and the effect of ethoxy groups' introduction into titanium compounds on the catalytic properties of MgCl2 - supported catalysts [with triisobutylaluminum (TIBA) or triethylaluminum (TEA) as cocatalyst] in ethylene polymerization and ethylene 1-hexene copolymerization, and on the polymer characteristics. To prepare supported titanium-magnesium catalysts of various compositions, soluble compounds of titanium in different oxidation states [?6-benzene-Ti2+Al2Cl8, Ti3+Cl3źnDBE, and Ti4+(OEt)2Cl2] were synthesized, analyzed by ESR and 13C NMR methods, and immobilized on the highly dispersed magnesium chloride. The data were obtained on the effects produced by composition and oxidation state of titanium compounds (covering also commonly used TiCl4) on the activity, control of PE molecular weight by hydrogen, copolymerization ability, and molecular weight distribution (MWD) of polyethylene. The results obtained demonstrate that different titanium precursors comprising Ti(II), Ti(III) and Ti(IV) compounds supported on MgCl2 allow preparing the highly active catalysts for ethylene polymerization or ethylene/1-hexene copolymerization. It was found that titanium oxidation state in the initial titanium compounds had a weak effect on the molecular weight and MWD of PE, whereas the ligand environment of titanium affected this parameter more strongly.

Keywords

katalizatory Zieglera-Natty ; nośnik magnezowy ; stopień utlenienia tytanu ; polimeryzacja ; aktywność katalizatora ; polietylen ; ciężar cząsteczkowy ; rozkład ciężaru cząsteczkowego Ziegler-type catalysts ; magnesium support ; titanium oxidation states ; polymerization ; catalyst activity ; polyethylene ; molecular weight ; molecular weight distribution

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Mikenas, T. B., Tregubov, A. A., Zakharov, V. A., Echevskaya, L. G., & Matsko, M. A. (2022). Titanium-magnesium catalysts for olefin polymerization - effect of titanium oxidation state on catalyst performance. Polimery, 53(5), 353–357. Retrieved from https://polimery.ichp.vot.pl/index.php/p/article/view/1318

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T. B. Mikenas mikenas@catalysis.nsk.su

Affiliation
Boreskov Institute of Catalysis, Siberian Branch of the Russian Academy of Sciences, Prospekt Akademika Lavrentieva 5, Novosibirsk 630090, Russia

A. A. Tregubov

V. A. Zakharov

L. G. Echevskaya

M. A. Matsko