Metallocene catalyst supported on a molecular sieve having tubules-within-a-tubule morphology for preparing olefin polymer

摘要

The present invention provides a metallocene catalyst supported on a molecular seive having "tubules-within-a-tubule" morphology. When the metallocene catalyst is used for preparing polyolefin, the MAO amount can be decreased to an amount such that the molar ratio of Al/Zr is below 200. Thus, production costs are greatly reduced.