Gas Phase Ethylene Polymerization by Single-Site Cr Centers in a MetalOrganic Framework
Name
acscatal.9b03282.pdf
Size
2.58 MB
Format
Adobe PDF
Checksum (MD5)
e6a5985a09483a312ab978befe64087a
Author(s)
Park, Hoyoung Daniel
Comito, Robert J.
Wu, Zhenwei
Zhang, Guanghui
Ricke, Nathan Darrell
Sun, Chenyue
Van Voorhis, Troy
Miller, Jeffrey T.
Roman-Leshkov, Yuriy
Dinca, Mircea
Date Issued
March 2020
Journal
ACS Catalysis
Citation
Park, Hoyoung Daniel, et al., "Gas Phase Ethylene Polymerization by Single-Site Cr Centers in a MetalOrganic Framework." ACS Catalysis 10, 6 (Mar. 2020): p. 3864-70 doi 10.1021/acscatal.9b03282 ©2020 Author(s)
Version
Final published version
Abstract
We report a systematic study on the gas-phase polymerization of ethylene by a metal–organic framework (MOF) catalyst. Cr3+-exchanged MFU-4l (Cr(III)-MFU-4l, MFU-4l = Zn5Cl4(BTDD)3, H2BTDD = bis(1H-1,2,3,-triazolo[4,5-b],[4′,5′-i])dibenzo[1,4]dioxin)) serves as an exemplary system to demonstrate prereaction treatment with alkylaluminum species as a simple method to isolate an active MOF catalyst for liquid-free polymerization of ethylene. AlMe3-treated Cr(III)-MFU-4l subjected to 40 bar of ethylene exhibits a polymerization activity of 52 000 molEthylene·molCr–1·h–1, an order of magnitude higher than that observed in a slurry-phase reaction with Cr(III)-MFU-4l and excess alkylaluminum species. Furthermore, product polyethylene exhibits a low polydispersity index of 1.36 and a free-flowing granular morphology favorable for industrial processing, highlighting the advantages conferred by the single-site MOF catalysts in gas-phase ethylene polymerization. Keywords:metal−organic framework; heterogeneous catalysis; single-site catalyst; polyethylene; gas-phase polymerization
MIT Department
Massachusetts Institute of Technology. Department of Chemistry
Massachusetts Institute of Technology. Department of Chemical Engineering
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Creative Commons Attribution 4.0 International license
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DOI of Published Version
https://doi.org/10.1021/acscatal.9b03282
