Polybenzimidazole (PBI) membrane materials are promising candidates for H2/CO2 separation at elevated temperatures (>150 �C) with industrially attractive permselectivity behavior. Commercially available PBI (m-PBI, Celazole�) offers advantages such as very high Tg (425 �C), excellent membrane mechanical property, good chemical resistance, and more importantly, very attractive H2/CO2 selectivity at high temperatures (>20 at 250 �C); however, its H2 permeability are low, which mandates ultrathin selective layers to achieve industrially attractive H2 flux. Our work has been focused on using chemical modification methods to manipulate PBI morphology (free volume), in order to achieve a better performance combination (gas permeability & selectivity). In this talk, different synthetic strategies such as PBI backbone modification and random copolymerization as well as the corresponding gas permeation results of new PBI derivatives will be discussed.

Novel polybenzimidazole (PBI) membranes for high temperature H<sub>2</sub>/CO<sub>2</sub> separation

248th National Meeting (2014)

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Novel polybenzimidazole (PBI) membranes for high temperature H2/CO2 separation

Novel polybenzimidazole (PBI) membranes for high temperature H₂/CO₂ separation