Microporous pentiptycene-based polybenzimidazole membranes for high temperature H2/CO2 separation

Liu, Mengdi; Emery, Joseph; Guo, Ruilan

doi:10.1016/j.memsci.2024.123673

Microporous pentiptycene-based polybenzimidazole membranes for high temperature H₂/CO₂ separation

Journal Article · Wed Jan 01 00:00:00 EST 2025 · Journal of Membrane Science

DOI:https://doi.org/10.1016/j.memsci.2024.123673· OSTI ID:2951299

^[1]; Emery, Joseph ^[1]; ^[1]

University of Notre Dame, IN (United States)

Separating H₂ from syngas at elevated temperatures (100–250 °C) have attracted significant attention in recent years as a means to reduce energy consumption and capital costs in precombustion carbon capture processes, such as those following steam reforming of natural gas or coal gasification. Polybenzimidazole (PBI), particularly m-PBI, has been reported as a leading membrane material for high-temperature H₂/CO₂ separation. However, m-PBI exhibits extremely low H₂ permeability, even at high temperatures, which limits its productivity in H₂/CO₂ separation applications. Here, to address this limitation, this work introduces a new pentiptycene-based polybenzimidazole (PPBI) featuring significantly enhanced H₂ permeability and attractive high-temperature H₂/CO₂ separation performance, which stems from the unique configurational free volume elements introduced by pentiptycene moieties. Further tuning of the free volume architecture of PPBI films is achieved via acid doping with phosphoric acid (PA) or trans-aconitic acid (TaA), which introduces crosslinking among PPBI chains. Under mixed-gas environment (50/50 mol% H₂/CO₂) at 180 °C, the acid-doped PPBI films exhibit a ∼230 % increase in H₂/CO₂ selectivity compared to pristine PPBI film while maintaining high H₂ permeability that is nearly 500 % of m-PBI. These properties approach the predicted upper bound for membrane operating at 180 °C, highlighting its great potential for high-temperature H₂/CO₂ separation.

View Accepted Manuscript (DOE)

Research Organization:: University of Notre Dame, IN (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES). Chemical Sciences, Geosciences & Biosciences Division (CSGB)

Grant/Contract Number:: SC0024384

OSTI ID:: 2951299

Journal Information:: Journal of Membrane Science, Journal Name: Journal of Membrane Science Vol. 718; ISSN 0376-7388

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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Microporous pentiptycene-based polybenzimidazole membranes for high temperature H₂/CO₂ separation