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Active Sites in a Heterogeneous Organometallic Catalyst for the Polymerization of Ethylene

[Image: see text] Heterogeneous derivatives of catalysts discovered by Ziegler and Natta are important for the industrial production of polyolefin plastics. However, the interaction between precatalysts, alkylaluminum activators, and oxide supports to form catalytically active materials is poorly un...

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Autores principales: Culver, Damien B., Dorn, Rick W., Venkatesh, Amrit, Meeprasert, Jittima, Rossini, Aaron J., Pidko, Evgeny A., Lipton, Andrew S., Lief, Graham R., Conley, Matthew P.
Formato: Online Artículo Texto
Lenguaje:English
Publicado: American Chemical Society 2021
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8323245/
https://www.ncbi.nlm.nih.gov/pubmed/34345672
http://dx.doi.org/10.1021/acscentsci.1c00466
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author Culver, Damien B.
Dorn, Rick W.
Venkatesh, Amrit
Meeprasert, Jittima
Rossini, Aaron J.
Pidko, Evgeny A.
Lipton, Andrew S.
Lief, Graham R.
Conley, Matthew P.
author_facet Culver, Damien B.
Dorn, Rick W.
Venkatesh, Amrit
Meeprasert, Jittima
Rossini, Aaron J.
Pidko, Evgeny A.
Lipton, Andrew S.
Lief, Graham R.
Conley, Matthew P.
author_sort Culver, Damien B.
collection PubMed
description [Image: see text] Heterogeneous derivatives of catalysts discovered by Ziegler and Natta are important for the industrial production of polyolefin plastics. However, the interaction between precatalysts, alkylaluminum activators, and oxide supports to form catalytically active materials is poorly understood. This is in contrast to homogeneous or model heterogeneous catalysts that contain resolved molecular structures that relate to activity and selectivity in polymerization reactions. This study describes the reactivity of triisobutylaluminum with high surface area aluminum oxide and a zirconocene precatalyst. Triisobutylaluminum reacts with the zirconocene precatalyst to form hydrides and passivates −OH sites on the alumina surface. The combination of passivated alumina and zirconium hydrides formed in this mixture generates ion pairs that polymerize ethylene.
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spelling pubmed-83232452021-08-02 Active Sites in a Heterogeneous Organometallic Catalyst for the Polymerization of Ethylene Culver, Damien B. Dorn, Rick W. Venkatesh, Amrit Meeprasert, Jittima Rossini, Aaron J. Pidko, Evgeny A. Lipton, Andrew S. Lief, Graham R. Conley, Matthew P. ACS Cent Sci [Image: see text] Heterogeneous derivatives of catalysts discovered by Ziegler and Natta are important for the industrial production of polyolefin plastics. However, the interaction between precatalysts, alkylaluminum activators, and oxide supports to form catalytically active materials is poorly understood. This is in contrast to homogeneous or model heterogeneous catalysts that contain resolved molecular structures that relate to activity and selectivity in polymerization reactions. This study describes the reactivity of triisobutylaluminum with high surface area aluminum oxide and a zirconocene precatalyst. Triisobutylaluminum reacts with the zirconocene precatalyst to form hydrides and passivates −OH sites on the alumina surface. The combination of passivated alumina and zirconium hydrides formed in this mixture generates ion pairs that polymerize ethylene. American Chemical Society 2021-07-13 2021-07-28 /pmc/articles/PMC8323245/ /pubmed/34345672 http://dx.doi.org/10.1021/acscentsci.1c00466 Text en © 2021 The Authors. Published by American Chemical Society https://creativecommons.org/licenses/by-nc-nd/4.0/Permits non-commercial access and re-use, provided that author attribution and integrity are maintained; but does not permit creation of adaptations or other derivative works (https://creativecommons.org/licenses/by-nc-nd/4.0/).
spellingShingle Culver, Damien B.
Dorn, Rick W.
Venkatesh, Amrit
Meeprasert, Jittima
Rossini, Aaron J.
Pidko, Evgeny A.
Lipton, Andrew S.
Lief, Graham R.
Conley, Matthew P.
Active Sites in a Heterogeneous Organometallic Catalyst for the Polymerization of Ethylene
title Active Sites in a Heterogeneous Organometallic Catalyst for the Polymerization of Ethylene
title_full Active Sites in a Heterogeneous Organometallic Catalyst for the Polymerization of Ethylene
title_fullStr Active Sites in a Heterogeneous Organometallic Catalyst for the Polymerization of Ethylene
title_full_unstemmed Active Sites in a Heterogeneous Organometallic Catalyst for the Polymerization of Ethylene
title_short Active Sites in a Heterogeneous Organometallic Catalyst for the Polymerization of Ethylene
title_sort active sites in a heterogeneous organometallic catalyst for the polymerization of ethylene
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8323245/
https://www.ncbi.nlm.nih.gov/pubmed/34345672
http://dx.doi.org/10.1021/acscentsci.1c00466
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