Investigation of competitive sorption and plasticization of hyperaged CANAL ladder polymers for acid gas purification

Yeo, Jing Ying; Benedetti, Francesco M.; Pedretti, Benjamin J.; Robinson, Ashley M.; Yin, Ruilin; Lai, Holden W.H.; Lee, Tae Hoon; Xia, Yan; Smith, Zachary P.

doi:10.1016/j.memsci.2025.123973

Investigation of competitive sorption and plasticization of hyperaged CANAL ladder polymers for acid gas purification

Journal Article · Fri Mar 14 00:00:00 EDT 2025 · Journal of Membrane Science

DOI:https://doi.org/10.1016/j.memsci.2025.123973· OSTI ID:3009951

Yeo, Jing Ying ^[1]; ^[1]; ^[1]; Robinson, Ashley M. ^[2]; ^[2]; ^[2]; ^[1]; Xia, Yan ^[2]; ^[1]

Massachusetts Institute of Technology (MIT), Cambridge, MA (United States)
Stanford University, CA (United States)

Identifying membrane materials that have exceptional separation performance and stability to complex CO₂-containing mixtures is a pressing topic in separation science. In this work, the membrane separation performance for a recently discovered class of contorted polymers synthesized via catalytic arene-norbornene annulation (CANAL) polymerization is presented. These CANAL polymers achieve high CO₂/CH₄ selectivity of 68 after physical aging (up to ∼1 year), which significantly augments the size-sieving capabilities of the membranes. Binary CO₂/CH₄ and ternary H₂S/CO₂/CH₄ testing result in a 41 % and 50 % enhancement in selectivities, respectively, for hyperaged (∼1 year) contorted CANAL polymers, highlighting their size-sieving capabilities. The remarkably high CO₂/CH₄ mixed-gas and combined acid gas (CAG, (CO₂+H₂S)/CH₄) selectivities of 88 and 95, respectively, for CANAL-Me-S₅F in particular surpass both the 2018 CO₂/CH₄ mixed-gas and CAG upper bounds. Performance stability was also investigated for high concentrations of CO₂, revealing a reduction in CO₂/CH₄ mixed-gas selectivity without compromising CO₂ permeability, suggesting strong sorption of CO₂ but minimal plasticization effects for short testing periods. In addition, time-dependent plasticization shows negligible effects on CO₂/CH₄ mixed-gas selectivity despite an increase in CO₂ permeability when exposed to high concentrations of plasticizing CO₂ over an extended period of 170 h. This study provides valuable insights into hyperaged CANAL polymers and their performance in practical industrial processes.

View Accepted Manuscript (DOE)

Research Organization:: Massachusetts Institute of Technology (MIT), Cambridge, MA (United States); Stanford University, CA (United States)

Sponsoring Organization:: USDOE Office of Science (SC)

Grant/Contract Number:: SC0019087; SC0023252

OSTI ID:: 3009951

Journal Information:: Journal of Membrane Science, Journal Name: Journal of Membrane Science Vol. 726; ISSN 0376-7388

Publisher:: Elsevier BVCopyright Statement

Country of Publication:: United States

Language:: English

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36 MATERIALS SCIENCE
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Investigation of competitive sorption and plasticization of hyperaged CANAL ladder polymers for acid gas purification

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