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Olefin Metathesis Polymerization: Acyclic Diene Metathesis (ADMET)00:53

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Selective Gas-Phase Ethylene Dimerization to 1-Butene in a Scalable Metal-Organic Framework.

Eric You1, Xiao Zhang1, Patrick Sarver1

  • 1Department of Chemistry, Massachusetts Institute of Technology, 77 Massachusetts Avenue, Cambridge, Massachusetts 02139, United States.

Journal of the American Chemical Society
|February 17, 2026
PubMed
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A novel metal-organic framework catalyst (Ni-CFA-1) enables efficient, continuous gas-phase ethylene dimerization to 1-butene. This heterogeneous process surpasses traditional methods in selectivity and activity, offering a scalable solution for producing this key plastics feedstock.

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Area of Science:

  • Materials Science
  • Catalysis
  • Chemical Engineering

Background:

  • High-purity 1-butene is essential for the plastics industry, currently produced via homogeneous ethylene dimerization.
  • Heterogeneous catalysis in the gas phase offers advantages for continuous processes and product recovery but lacks efficient catalysts for ethylene dimerization.
  • Existing gas-phase catalysts exhibit low activity and selectivity, hindering industrial application.

Purpose of the Study:

  • To develop a scalable, robust heterogeneous catalyst for continuous gas-phase ethylene dimerization.
  • To achieve high selectivity and activity in 1-butene production using a metal-organic framework (MOF).
  • To demonstrate the feasibility of a solvent-free flow process for industrial chemical synthesis.

Main Methods:

  • Synthesis and characterization of nickel-exchanged CFA-1 (Ni-CFA-1) MOF catalyst.
  • Gas-phase ethylene dimerization experiments in a packed-bed reactor under solvent-free conditions.
  • Evaluation of catalyst performance including selectivity, turnover frequency, and total turnover number.

Main Results:

  • The MeNi-CFA-1 catalyst achieved 96% selectivity for 1-butene production.
  • Exceptional turnover frequencies (>800,000 mol ethylene·mol Ni-1·h-1) and total turnover numbers (1.23 × 108 mol ethylene·mol Ni-1) were recorded.
  • The process yielded 49.4 kg of 1-butene per gram of MOF without requiring catalyst reactivation, outperforming commercial homogeneous catalysts.

Conclusions:

  • Metal-organic frameworks can serve as highly effective heterogeneous catalysts for gas-phase reactions.
  • The developed Ni-CFA-1 MOF catalyst offers a superior, scalable, and sustainable alternative for 1-butene production.
  • This work bridges molecular precision with industrial practicality, showcasing MOFs for commodity chemical synthesis.