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Amino functionalised hybrid ultramicroporous materials that enable single‐step ethylene purification from a ternary mixture

DOI: 10.1002/anie.202100240 DOI Help

Authors: Michael Zaworotko (University of Limerick) , Soumya Mukherjee (University of Limerick) , Naveen Kumar (University of Limerick) , Andrey A. Bezrukov (University of Limerick) , Kui Tan (University of Texas at Dallas) , Tony Pham (The University of Tampa) , Katherine A. Forrest (University of South Florida) , Kolade Oyekan (University of Texas at Dallas) , Omid T. Qazvini (Manchester University) , David G. Madden (University of Limerick) , Brian Space (University of South Florida)
Co-authored by industrial partner: No

Type: Journal Paper
Journal: Angewandte Chemie International Edition

State: Published (Approved)
Published: January 2021
Diamond Proposal Number(s): 20500

Open Access Open Access

Abstract: Pyrazine‐linked hybrid ultramicroporous (pore size <7 Å) materials (HUMs) offer benchmark performance for trace carbon capture thanks to strong selectivity for CO2 over small gas molecules, including light hydrocarbons. That the prototypal pyrazine‐linked HUMs are amenable to crystal engineering has enabled second generation HUMs to supersede the performance of the parent HUM, SIFSIX‐3‐Zn, mainly through substitution of the metal and/or the inorganic pillar. Herein, we report that two isostructural aminopyrazine‐linked HUMs, MFSIX‐17‐Ni (17 = aminopyrazine; M = Si, Ti), which we had anticipated would offer even stronger affinity for CO2 than their pyrazine analogs, unexpectedly exhibit reduced CO2 affinity but enhanced C2H2 affinity. MFSIX‐17‐Ni are consequently the first physisorbents that enable single‐step production of polymer‐grade (>99.95% for SIFSIX‐17‐Ni) ethylene from a ternary equimolar mixture of ethylene, acetylene and CO2 thanks to coadsorption of the latter two gases. We attribute this performance to the very different binding sites in MFSIX‐17‐Ni versus SIFSIX‐3‐Zn.

Journal Keywords: ultramicroporous; materials ethylene; purification ternary; separation binding site

Subject Areas: Materials, Chemistry

Instruments: I11-High Resolution Powder Diffraction

Added On: 01/02/2021 13:29


Discipline Tags:

Chemistry Materials Science Organic Chemistry

Technical Tags:

Diffraction X-ray Powder Diffraction