Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 13, Issue 10, Pages 12521-12530Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsami.0c23098
Keywords
polybenzimidazole; polycarboxylic acid; H-2/CO2 separation; cross-linking; membranes; carbon capture
Funding
- U.S. Department of Energy (DOE) [DE-FE0031636]
- U.S. National Science Foundation (NSF) [1804996]
- National Nuclear Security Administration of the U.S. Department of Energy [89233218CNA000001]
- Directorate For Engineering
- Div Of Chem, Bioeng, Env, & Transp Sys [1804996] Funding Source: National Science Foundation
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The study found that Polybenzimidazole (PBI) can be cross-linked with polycarboxylic acids to improve its H2/CO2 separation properties, and the acid-doped samples demonstrate stable separation performance at high temperatures and humidity.
Polybenzimidazole (PBI) with a strong size-sieving ability exhibits attractive H-2/CO2 separation properties for blue H-2 production and CO2 capture. Herein, we report that PBI can be facilely cross-linked with polycarboxylic acids, oxalic acid (OA), and trans-aconitic acid (TaA) to improve its separation performance. The acids react with the amines on the PBI chains, decreasing free volume and increasing size-sieving ability. The acid doping increases H-2/CO2 selectivity from 12 to as high as 45 at 35 degrees C. The acid-doped samples demonstrate stable H-2/CO2 separation performance when challenged with simulated syngas containing water vapor at 150 degrees C, which surpasses state-of-the-art polymers and Robeson's upper bound for H-2/CO2 separation.
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