Unprecedented size-sieving ability in polybenzimidazole doped with polyprotic acids for membrane H2/CO2 separation
Abstract
Polymers with efficient and tight chain-packing and thus strong size-sieving ability are of great interest for H2/CO2 separation. In this communication, we demonstrate a new approach to manipulating polymer structure by acid doping, leading to superior H2/CO2 separation performance. We have doped polybenzimidazole (PBI) with polyprotic acids, specifically H3PO4 and H2SO4. These acids cross-link PBI chains and drastically decrease free volume, improving the material's H2/CO2 selectivity to far surpass the Robeson's 2008 upper bound for membrane performance. For example, PBI doped with H3PO4 at a molar ratio of 1 : 1 exhibits an unprecedented H2/CO2 selectivity of 140 at 150 °C, which exceeds that of previously known polymeric materials and is superior or comparable to that of state-of-the-art 2D materials with sharp size separation, such as graphene oxide, MoS2, and metal–organic frameworks. This facile approach to enhancing polymer chain-packing efficiency opens up a new avenue for designing strong size-sieving polymers for membrane gas separations.
- Publication Date:
- Research Org.:
- Univ. at Buffalo, NY (United States)
- Sponsoring Org.:
- USDOE Office of Fossil Energy (FE); National Science Foundation (NSF)
- OSTI Identifier:
- 1659662
- Grant/Contract Number:
- FE0026463
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Energy & Environmental Science
- Additional Journal Information:
- Journal Volume: 11; Journal Issue: 1; Journal ID: ISSN 1754-5692
- Publisher:
- Royal Society of Chemistry
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 20 FOSSIL-FUELED POWER PLANTS
Citation Formats
Zhu, Lingxiang, Swihart, Mark T., and Lin, Haiqing. Unprecedented size-sieving ability in polybenzimidazole doped with polyprotic acids for membrane H2/CO2 separation. United States: N. p., 2017.
Web. doi:10.1039/c7ee02865b.
Zhu, Lingxiang, Swihart, Mark T., & Lin, Haiqing. Unprecedented size-sieving ability in polybenzimidazole doped with polyprotic acids for membrane H2/CO2 separation. United States. https://doi.org/10.1039/c7ee02865b
Zhu, Lingxiang, Swihart, Mark T., and Lin, Haiqing. Tue .
"Unprecedented size-sieving ability in polybenzimidazole doped with polyprotic acids for membrane H2/CO2 separation". United States. https://doi.org/10.1039/c7ee02865b. https://www.osti.gov/servlets/purl/1659662.
@article{osti_1659662,
title = {Unprecedented size-sieving ability in polybenzimidazole doped with polyprotic acids for membrane H2/CO2 separation},
author = {Zhu, Lingxiang and Swihart, Mark T. and Lin, Haiqing},
abstractNote = {Polymers with efficient and tight chain-packing and thus strong size-sieving ability are of great interest for H2/CO2 separation. In this communication, we demonstrate a new approach to manipulating polymer structure by acid doping, leading to superior H2/CO2 separation performance. We have doped polybenzimidazole (PBI) with polyprotic acids, specifically H3PO4 and H2SO4. These acids cross-link PBI chains and drastically decrease free volume, improving the material's H2/CO2 selectivity to far surpass the Robeson's 2008 upper bound for membrane performance. For example, PBI doped with H3PO4 at a molar ratio of 1 : 1 exhibits an unprecedented H2/CO2 selectivity of 140 at 150 °C, which exceeds that of previously known polymeric materials and is superior or comparable to that of state-of-the-art 2D materials with sharp size separation, such as graphene oxide, MoS2, and metal–organic frameworks. This facile approach to enhancing polymer chain-packing efficiency opens up a new avenue for designing strong size-sieving polymers for membrane gas separations.},
doi = {10.1039/c7ee02865b},
journal = {Energy & Environmental Science},
number = 1,
volume = 11,
place = {United States},
year = {Tue Dec 12 00:00:00 EST 2017},
month = {Tue Dec 12 00:00:00 EST 2017}
}
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