In the present work, 1,3,5-tribenzylhexahydro-1,3,5-triazinc-CrCl3 (TAC-CrCl3) Complex was supported on Stober silica and on commercial porous SiO2. Ethylene polymerization and copolymerization were carried with methylaluminoxane (MAO) as co-catalyst. In the polymerization of ethylene, the silica-supported TAC-CrCl3 catalysts exhibit activity values from 200 to 374 kg/molCr/h with Stober silica being the best. In the copolymerization of ethylene with 1-hexene, the yields of polymer are 34-117 kg/molCr/h; the highest value is again obtained with Stober silica as a support. The polymers were characterized by X-ray diffraction, solid-state C-13 NMR, viscosimetric analysis and differential scanning calorimeter (DSC). The polymers have molecular weights of 23,000-40,000 g/mol; crystallinity varies from 60 to 68% and melting points in the range 125131 degrees C. (c) 2005 Elsevier B.V. All rights reserved.