Studies on probing SiO2 surface using BF3 as probe and SiO2/Al2Et3Cl3/TiCl4(PhMgCl) catalytic system for copolymerization of ethylene and propylene

Using BF3 as probe, the surface of SiO2 was probed. The effects of the roas t temperature on the SiO2 surface were investigated and a possible mechanis m is suggested. Using SiO2 as starting material for supports, new supported catalysts for copolymerization of ethylene and propylene were prepared and their possible structures are discussed. It was found that higher polymeri zation productivity, for instance, 480 kg P/mol(Ti) h, can be obtained by u sing a SiO2/Al2Et3Cl3/TiCl4 catalytic system and addition of PhMgCl to this catalytic system can significantly increase polymerization activity. (C) 2 000 John Wiley & Sons, Inc.