The effect of porous structure of the support on activity of titanium catalyst in the low-pressure ethylene polymerization process has been investigated. As a support, physically (heating in the temperature range of 773—1373 K) or chemically (by treatment with HC1) modified alumina has been used. Specific surface, volume, and radius of pores present on the support surface have been determined and correlated with the conditions of its modification. The supported titanium catalysts have been activated with an organoaluminium compound, Et3Al2Cl3, and used in the low-pressure ethylene polymerization. The dependence of the catalytic activity of these systems on the porous structure of the oxide-type supports used has been established. Maximum activity has been obtained with a support with pores of relatively small volume and with a radius of about 4 nm.
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