6533b7d5fe1ef96bd126542c

RESEARCH PRODUCT

Rola chlorku magnezu jako nośnika katalizatorów Zieglera-Natty

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Structural examination data are presented for various supports. Porosimetry (Table 2) and particle size distribution studies on MgCl 2, MgCl 2(THF) 2, Al 2O 3 as supports, carried out prior to and after ball-milling (Figs. 1, 3), suggest that MgCl 2 is beneficial as carrier because it is more liable to pretreatment (ball-milling, presence of a Lewis base) and allows its mass to be better utilized and its surface to produce catalytically active centers. Prolonged ball-milling of MgCl 2 was found to result not only in comminuted particles but also in increased specific area and larger pore volume. Studies on synthesis conditions of a vanadium precursor supported on MgCl 2(THF) 2 showed prolonged ball-milling to be indispensable to prepare a high-activity catalyst. Various Ziegler-Natta catalysts were compared in terms of the activity to polymerize ethylene, supported on MgCl 2 or Al 2O 3 that had been ball-milled for 24 h (Table 4).