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Molecularly Engineering Polymeric Membranes for Pre-Combustion CO2 Capture at 150 ? and Above

Source: AIChE
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  • Type:
    Conference Presentation
  • Conference Type:
    AIChE Annual Meeting
  • Presentation Date:
    November 19, 2020
  • Duration:
    18 minutes
  • Skill Level:
    Intermediate
  • PDHs:
    0.30

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Membrane materials with high H2 permeability and H2/CO2 selectivity at 150–300 oC hold promise for pre-combustion CO2 capture. However, polymers with high permeability tend to exhibit weak size-sieving abilities and thus low selectivity. Polybenzimidazole (PBI) is one of the leading membrane materials for H2/CO2 separation for H2 purification and pre-combustion CO2 capture. For example, PBI exhibits H2 permeability of 27 Barrers and H2/CO2 selectivity of 14 at 150 oC, which is on the Robeson’s upper bound. Herein we demonstrate that PBI can be engineered to further improve the H2/CO2 separation performance. For example, PBI can be doped by polyprotic acid to increase the size-sieving ability and thus H2/CO2 selectivity to as high as 130; PBI can be carbonized to obtain “hourglass” free volumes and thus improve the H2 permeability to 54 Barrer and H2/CO2 selectivity to 80; and PBI can be doped with Palladium nanoparticles to increase H2 solubility and thus achieve H2 permeability of 48 Barrer and H2/CO2 selectivity of 43. We determined the mixed-gas separation properties of these materials, demonstrating their stability for long-term operation in the presence of water vapor. The structure/property relationship in these materials will also be elucidated.
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Checkout

Do you already own this?

Pricing


Individuals

AIChE Member Credits 0.5
AIChE Members $19.00
AIChE Graduate Student Members Free
AIChE Undergraduate Student Members Free
Non-Members $29.00
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