CATEGORY:
METAL ORGANIC FRAMEWORKS
Single-Site Heterogeneous Catalysts for Olefin Polymerization Enabled by Cation Exchange in a Metal-Organic Framework
Single-Site Heterogeneous Catalysts for Olefin Polymerization Enabled by Cation Exchange in a Metal-Organic Framework
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Type
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Journal
Article
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Author
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Robert
J. Comito
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Author
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Keith
J. Fritzsching
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URL
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Volume
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138
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Issue
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32
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Pages
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10232-10237
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Publication
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Journal
of the American Chemical Society
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Date
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August
17, 2016
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Abstract
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The
manufacture of advanced polyolefins was enabled by the development of
single-site heterogeneous catalysts. Metal-organic frameworks (MOFs)
demonstrate great potential as heterogeneous catalysts that may be designed
and tuned on the molecular level. Authors report exchange of zinc ions in
Zn5Cl4(BTDD)3, H2BTDD =
bis(1H-1,2,3-triazolo[4,5-b],[4′,5′-i])dibenzo[1,4]dioxin) (MFU-4l) with
reactive metals serving to establish a general platform for selective olefin
polymerization in a high surface area solid promising for industrial
catalysis.
Characterization of polyethylene produced by these materials demonstrates both molecular and morphological control. Reactivity approaches single-site catalysis, as evidenced by low polydispersity indices, and good molecular weight control. Authors show that these new catalysts copolymerize ethylene and propylene. Uniform growth of the polymer around the catalyst particles provides a mechanism for controlling the polymer morphology, a relevant metric for continuous flow processes. |
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