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Stabilized Vanadium Catalyst for Olefin Polymerization by Site Isolation in a Metal–Organic Framework
Author(s) -
Comito Robert J.,
Wu Zhenwei,
Zhang Guanghui,
Lawrence John A.,
Korzyński Maciej D.,
Kehl Jeffrey A.,
Miller Jeffrey T.,
Dincă Mircea
Publication year - 2018
Publication title -
angewandte chemie
Language(s) - English
Resource type - Journals
eISSN - 1521-3757
pISSN - 0044-8249
DOI - 10.1002/ange.201803642
Subject(s) - vanadium , methylaluminoxane , polymerization , polyethylene , catalysis , dispersity , olefin fiber , chemistry , coordination polymerization , polymer chemistry , metal organic framework , materials science , organic chemistry , solution polymerization , polymer , metallocene , adsorption
Vanadium catalysts offer unique selectivity in olefin polymerization, yet are underutilized industrially owing to their poor stability and productivity. Reported here is the immobilization of vanadium by cation exchange in MFU‐4 l , thus providing a metal–organic framework (MOF) with vanadium in a molecule‐like coordination environment. This material forms a single‐site heterogeneous catalyst with methylaluminoxane and provides polyethylene with low polydispersity (PDI≈3) and the highest activity (up to 148 000 h −1 ) reported for a MOF‐based polymerization catalyst. Furthermore, polyethylene is obtained as a free‐flowing powder as desired industrially. Finally, the catalyst shows good structural integrity and retains polymerization activity for over 24 hours, both promising attributes for the commercialization of vanadium‐based polyolefins.