Half-titanocene catalysts (CpTiCl3，CpTi(OBz)3) supported on MgCl2/AlEtn(OEt)3-n were used for ethylene polymerization with a cocatalyst of common inexpensive AlEt2Cl.The polymerization conditions such as the cocatalyst

Al/Ti ratio and temperature had significant effects on catalytic activity and properties of the resultant polyethylene.Results showed that the two supported catalysts exhibited high activity in the presence of AlEt2Cl with 105g PE/(mol Ti#8226;h) magnitude of order

and the viscometric molecular weight of the obtained polyethylene was higher than 105.In addition

the prepared polyethylene was essentially linear polyethylene according to 13C-NMR and DSC analyses.Compared with the corresponding homogeneous catalyst system

the kinetic curves of polymerization were quite steady during the reaction process.It is recommended that the surface morphology and the internal porous structure of the supported catalyst were beneficial for the dispersion of active species

resulting in the increase of the activity

and the active species anchored on confined space of MgCl2/AlEtn(OEt)3-n pores could inhibit the occurrence of β-H elimination reaction.