The effect of loading of oxide carriers with zirconium organic compounds on the polymerization of ethylene (in English)
The polymerization of ethylene was studied with supported catalysts obtained by reaction of zirconiumtetrabenzyl and aluminium oxide. The influence of the porosity, the thermal pretreatment of the carrier and the quantity of the anchored metal organic compound on the overall rate of the ethylene polymerization was established. With increasing loading of zirconiumtetrabenzyl on the catalyst, the rate exhibits a maximum, which is shifted to higher contents of metal organyl on the support, if the portion of the macro pores of the carrier inereases. The deactivation reaction of the catalyst depends on the thermal pretreatment of the carrier. Because of this and other results, it must be assumed that the free hydroxyl groups on the catalyst are responsible for this deactivation. The activity of the catalyst is influenced by the accessibility of the hydroxyl groups on the surface of the pores of the carrier.
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