Abstract:

The recent progress of immobilized catalysts for ethylene oligomerizatioin to α-olefin is reviewed. The structures and properties of carriers，the effects of methods of immobilization，cocatalyst，and interaction between main catalyst and its carrier in immobilized catalysts on the reaction of ethylene oligomerization are discussed. The catalytic performance of a homogenous catalyst immobilized on a carrier might suffer some changes due to the changes of stereoregularity and stereospecificity of active sites and electron density of active metal centers in the homogenous catalyst，which results in the interaction of carrier with active metal when it is immobilized. Most of the immobilized catalysts exhibit low catalytic activities. Moreover，the reaction mechanism of immobilized catalysts is also discussed. It is proposed that the further work should focus on exploiting new style carriers，novel and effective methods of immobilization，and clarifying the relationship of catalyst and carrier when developing immobilized catalysts.