Abstract
AbstractBisupported catalysts for olefin polymerization were prepared by mixing a butyl alcoholate solution of MgCI2 with pretreated SiO2 in heptane, and further treating with TiCI4 solution. The silica pretreating conditions and their effects on the composition of the catalysts were studied. The interaction mechanism of the two supports, MgCI2 and SiO2, is discussed. The effect of the composition and the structure of the catalyst on the behaviour of ethylene and propylene polymerization is described. The calcination temperature of SiO2 has a significant effect on composition, structure and properties of the catalysts. There exist both chemical bonding and physical absorption between SiO2 and MgCI2 supports. The activities for propylene polymerization remarkably increase with increasing mole ratio Mg/Ti of the catalysts, while for ethylene polymerization, the activities mainly depend on the Ti content of the catalysts and the calcination temperature of SiO2 used.
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