Effective and energy efficient ethylene separations from other small molecules can reduce significantly energy consumption, as compared to the state-of-the-art cryogenic separation of ethylene. Zeolite materials offer high thermal and chemical stability, low toxicity and moderate cost comparing to other adsorbent materials. ZK-5 (KFI) zeolite can be synthesized with high Al content (Si/Al = 4) and have a large concentration of 6- and 8-rings in the framework, both allowing accessible ion exchange positions for transition metal cations. Paired with metal cations with the appropriate radii (M2+ = Zn2+, Mn2+), the 6-rings in zeolite framework could allow for favorable adsorbate-adsorbent interactions with ethylene. These materials are likely more effective than the commonly used zeolite A based materials, and more economical than the recently proposed Ag-exchanged zeolites. Adsorption isotherms of ethylene and ethane show a larger difference in ethylene-ethane adsorption capacity at equilibrium for M2+-ZK-5 than Na-ZK-5, demonstrating a higher ethylene-ethane selectivity at high pressures (&gt; 0.15 atm). Isosteric heat of adsorption data show that Mn-ZK-5 obtains higher heat of adsorption than Zn-ZK-5 and also Na-ZK-5 (at lower coverages). Diffraction patterns and structural analysis are planned to elucidate the specific interactions between ethylene molecules and these ion exchanged zeolite materials.

Transition metal ion exchanged ZK-5 zeolite for ethylene separation

Macromolecular Chemistry: The Second Century

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ACS Spring 2020 National Meeting & Expo

The official archive and repository for all ACS Meetings & Expositions abstracts and select posters or presentations.