期刊
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
卷 55, 期 37, 页码 11203-11206出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/anie.201604136
关键词
EPR spectroscopy; operando FT-IR spectroscopy; tandem catalysis; Ti3+ sites; Ziegler-Natta catalysts
An original step-by-step approach to synthesize and characterize a bifunctional heterogeneous catalyst consisting of isolated Ti3+ centers and strong Lewis acid Al3+ sites on the surface of a chlorinated alumina has been devised. A wide range of physicochemical and spectroscopic techniques were employed to demonstrate that the two sites, in close proximity, act in a concerted fashion to synergistically boost the conversion of ethylene into branched polyethylene, using ethylene as the only feed and without any activator. The coordinatively unsaturated Al3+ ions promote ethylene oligomerization through a carbocationic mechanism and activate the Ti3+ sites for the traditional ethylene coordination polymerization.
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