Tightening polybenzimidazole (PBI) nanostructure via chemical cross-linking for membrane H2/CO2 separation

Zhu, Lingxiang; Swihart, Mark T.; Lin, Haiqing

doi:10.1039/C7TA03874G

Tightening polybenzimidazole (PBI) nanostructure via chemical cross-linking for membrane H₂/CO₂ separation

Journal Article · Tue Sep 05 00:00:00 EDT 2017 · Journal of Materials Chemistry. A

DOI:https://doi.org/10.1039/C7TA03874G· OSTI ID:1398377

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Univ. at Buffalo, The State Univ. of New York, Buffalo, NY (United States); University at Buffalo
Univ. at Buffalo, The State Univ. of New York, Buffalo, NY (United States)

Membranes that permeate H₂ and reject CO₂ at temperatures above 150 °C are of great interest for low-cost H₂ purification and pre-combustion CO₂ capture. One of the leading polymers for this separation is poly[2,2'-(m-phenylene)-5,5'-bisbenzimidazole] (PBI), which has good thermal stability and high H₂/CO₂ selectivity. This study, for the first time, demonstrates that H₂/CO₂ selectivity can be significantly enhanced by chemical cross-linking of PBI in solid state, in distinct contrast with the literature where cross-linking PBI in solutions decreased H₂/CO₂ selectivity. We prepared a series of cross-linked PBIs by immersing PBI thin films in terephthaloyl chloride solutions for varying times to achieve different degrees of cross-linking, and then systematically investigated the effect of cross-linking on physical properties including gel content, thermal stability, cross-linking density, fractional free volume (FFV) and inter-chain spacing. Gas sorption and pure- and mixed-gas permeation properties were determined at temperatures ranging from 35 to 200 °C. Cross-linking decreased CO₂ sorption and significantly increased H₂/CO₂ selectivity with a slight decrease in H₂ permeability. For example, after cross-linking of PBI, the H₂/CO₂ selectivity increased from 15 to 23 while the H₂ permeability decreased from 45 to 39 Barrers at 200 °C. As a result, the performance of this cross-linked PBI surpasses the Robeson's upper bound estimated at 200 °C, indicating its promise for H₂ purification and CO₂ capture.

View Accepted Manuscript (DOE)

Research Organization:: Univ. at Buffalo, NY (United States)

Sponsoring Organization:: National Science Foundation (NSF); USDOE Office of Fossil Energy (FE)

Grant/Contract Number:: FE0026463

OSTI ID:: 1398377

Alternate ID(s):: OSTI ID: 1659663

Journal Information:: Journal of Materials Chemistry. A, Journal Name: Journal of Materials Chemistry. A Journal Issue: 37 Vol. 5; ISSN JMCAET; ISSN 2050-7488

Publisher:: Royal Society of ChemistryCopyright Statement

Country of Publication:: United States

Language:: English

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