Abstract
Alumina-silica possessing various Al 2O 3/SiO 2 ratios was used as a carrier of surface titanium complexes. The systems obtained were examined as models for the investigation of the macroligand (inorganic gel) influence on the physicochemical properties of supported transition metal complexes. The titanium complexes were prepared first by the reaction of CpTiCl 3, with the hydroxyl groups of the gel and then reduced by an excess of BuLi. The influence was established of the basic gel properties on: (a) the amount of titanium(IV) and titanium(III) complexes on the alumina-silica gel surfaces; (b) the symmetry of the surface Ti III surface complexes; (c) the electron density around the surface-Ti III ions, ionic or covalent bonds character in a complex; and (d) the catalytic activity in olefin hydrogenation.
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