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Organometallic vanadium-based heterogeneous catalysts for ethylene polymerization. Study of the deactivation process

✍ Scribed by Krystyna Czaja; Marzena Bialek

Publisher
John Wiley and Sons
Year
1998
Tongue
English
Weight
328 KB
Volume
19
Category
Article
ISSN
1022-1336

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✦ Synopsis

Slurry polymerizations of ethylene over vanadium catalysts (based on VC4 and V0Cl3) and their MgC12(THF)2-supported equivalents were studied. Unsupported vanadium catalysts were found to be unstable while the vanadium active sites deposited on the MgC12(THF)2 complex are stable. A sharply outlined correlation was found between the concentration of vanadium(II1) and catalyst productivity. The high activity and stability of the vanadium catalyst when supported on the magnesium complex is attributed to the increase of resistance to reduction of active vanadium(II1) to inactive vanadium(I1) by an organoaluminium co-catalyst.

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