Gas Phase Ethylene Polymerization by Single-Site Cr Centers in a MetalOrganic Framework
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; ... Show more Show less
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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
Date issued
2020-03Department
Massachusetts Institute of Technology. Department of Chemistry; Massachusetts Institute of Technology. Department of Chemical EngineeringJournal
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
ISSN
2155-5435