A new supported catalytic system of Cp Zr Cl2/ B F3/ Al2 O3 for ethylenepolymerization was prepared . The preparation conditions such as pretreatment temperature ,reaction time and the concentration of added B F3 w...A new supported catalytic system of Cp Zr Cl2/ B F3/ Al2 O3 for ethylenepolymerization was prepared . The preparation conditions such as pretreatment temperature ,reaction time and the concentration of added B F3 were investigated . It was found that thechemicalreaction and physical adsorption occurred between B Fand Al2 O3 . Their frequencywas dependent on the O Hconcentration at Al2 O3 surfaces. Ahigher polymerization activity106 ～107g P E/mol Zr·h was obtained by using the resultantsupported catalysteven atlower[ Al]/[ Zr] ratios.展开更多
文摘A new supported catalytic system of Cp Zr Cl2/ B F3/ Al2 O3 for ethylenepolymerization was prepared . The preparation conditions such as pretreatment temperature ,reaction time and the concentration of added B F3 were investigated . It was found that thechemicalreaction and physical adsorption occurred between B Fand Al2 O3 . Their frequencywas dependent on the O Hconcentration at Al2 O3 surfaces. Ahigher polymerization activity106 ～107g P E/mol Zr·h was obtained by using the resultantsupported catalysteven atlower[ Al]/[ Zr] ratios.
