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

Abstract

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 PBImore » surpasses the Robeson's upper bound estimated at 200 °C, indicating its promise for H2 purification and CO2 capture.« less

Authors:
ORCiD logo [1]; ORCiD logo [1]; ORCiD logo [1]
  1. Univ. at Buffalo, The State Univ. of New York, Buffalo, NY (United States)
Publication Date:
Research Org.:
Univ. at Buffalo, NY (United States)
Sponsoring Org.:
USDOE Office of Fossil Energy (FE); National Science Foundation (NSF)
OSTI Identifier:
1398377
Alternate Identifier(s):
OSTI ID: 1659663
Grant/Contract Number:  
FE0026463; 1554236
Resource Type:
Journal Article: Accepted Manuscript
Journal Name:
Journal of Materials Chemistry. A
Additional Journal Information:
Journal Volume: 5; Journal Issue: 37; Journal ID: ISSN 2050-7488
Publisher:
Royal Society of Chemistry
Country of Publication:
United States
Language:
English
Subject:
08 HYDROGEN; 20 FOSSIL-FUELED POWER PLANTS

Citation Formats

Zhu, Lingxiang, Swihart, Mark T., and Lin, Haiqing. Tightening polybenzimidazole (PBI) nanostructure via chemical cross-linking for membrane H2/CO2 separation. United States: N. p., 2017. Web. doi:10.1039/C7TA03874G.
Zhu, Lingxiang, Swihart, Mark T., & Lin, Haiqing. Tightening polybenzimidazole (PBI) nanostructure via chemical cross-linking for membrane H2/CO2 separation. United States. https://doi.org/10.1039/C7TA03874G
Zhu, Lingxiang, Swihart, Mark T., and Lin, Haiqing. 2017. "Tightening polybenzimidazole (PBI) nanostructure via chemical cross-linking for membrane H2/CO2 separation". United States. https://doi.org/10.1039/C7TA03874G. https://www.osti.gov/servlets/purl/1398377.
@article{osti_1398377,
title = {Tightening polybenzimidazole (PBI) nanostructure via chemical cross-linking for membrane H2/CO2 separation},
author = {Zhu, Lingxiang and Swihart, Mark T. and Lin, Haiqing},
abstractNote = {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.},
doi = {10.1039/C7TA03874G},
url = {https://www.osti.gov/biblio/1398377}, journal = {Journal of Materials Chemistry. A},
issn = {2050-7488},
number = 37,
volume = 5,
place = {United States},
year = {Tue Sep 05 00:00:00 EDT 2017},
month = {Tue Sep 05 00:00:00 EDT 2017}
}

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Works referenced in this record:

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Works referencing / citing this record:

Sorption‐Enhanced Mixed Matrix Membranes with Facilitated Hydrogen Transport for Hydrogen Purification and CO 2 Capture
journal, July 2019


Effects of tertiary amines and quaternary ammonium halides in polysulfone on membrane gas separation properties
journal, September 2018


Novel high performance poly( p -phenylene benzobisimidazole) (PBDI) membranes fabricated by interfacial polymerization for H 2 separation
journal, January 2019