原位反应法制备CpTi(dbm)Cl_2/MgCl_2载体型催化剂及其催化乙烯聚合的研究

非茂催化剂对烯烃聚合显示出优异的催化特性，是继ziegler—Natta催化剂及茂金属催化剂之后的新一代烯烃聚合催化剂^1]，其中非环戊二烯基配体有含氮化合物2-8]和含氧化合物^9-15]等，这些非茂配合物可催化乙烯或丙烯聚合．将金属中心与一个环戊二烯基和一个非环戊二烯基配体而

In situ SYNTHESIS OF CpTi(dbm)Cl2/MgCl2 CATALYST AND ITS CATALYSIS FOR ETHYLENE POLYMERIZATION

A novel non metallocene supported catalyst,CpTi(dbm) Cl 2/MgCl 2 was synthesized in situ via reaction between CpTi(dbm)Cl 2 an d BuMgCl in heptane.The surface area,pore volume and crystal structure of the su pported catalyst and MgCl 2(in situ) which was obtained by reaction of Mg a nd BuCl were characterized by BET and XRD methods,respectively.The surface area and pore volume of MgCl 2(in situ) are higher than those of normal MgCl 2,and the s urface area and pore volume of the supported catalyst are also high.The crystal structure of the supported catalyst is amorphous,which is similar to that of MgC l 2(in situ).Ethylene polymerization with MAO or AlR 3 was investigated,w hich indicates that the activity does not decrease while AlR 3 was used as co catalyst instead of MAO,so MAO can be absent in both the catalyst preparation an d et hylene polymerization processes.The catalytic activity can be as high as 3 06× 10\+6gPE/molTi·h with triisobutyl aluminium(Ti BA) as co\|catalyst when polymerization tem perature is 80℃,and Al/Ti molar ratio is 200.