Abstract
27 Al NMR MAS method has been used to study the surface aluminium compounds forming during the treatment of supported TiCl 4/MgCl 2 catalyst with organoaluminium compounds (OAC) of various composition (AlEt 3, AlOct 3, AlEt 2Cl). Dialkylaluminium chloride has been found to be the main surface compound in the case of trialkylaliminium. Three surface species of dialkylaluminium chloride have been identified: one of them corresponds to 5-coordinated aluminium; the other two correspond to 6-coordinated aluminium with different alkyl-to-chlorine ratio. The relative amounts of surface species depend on the conditions of OAC reaction with catalysts and OAC composition. After polymerization of ethylene or propylene on trioctylaluminium-treated catalysts (polymer yield ca. 1 g/1 g catalyst), the signals of 5-coordinated aluminium disappear from the 27 Al NMR spectra of the catalysts.
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