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    Gas separation performance and physical aging of tubular thin-film composite carbon molecular sieve membranes based on a polyimide of intrinsic microporosity precursor

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    Type
    Article
    Authors
    Ogieglo, Wojciech
    Puspasari, Tiara cc
    Alabdulaaly, Abdullah cc
    Nga Nguyen, Thi Phuong
    Lai, Zhiping cc
    Pinnau, Ingo cc
    KAUST Department
    Advanced Membranes and Porous Materials Research Center
    Chemical Engineering Program
    Physical Science and Engineering (PSE) Division
    KAUST Grant Number
    BAS/1/1323-01-01
    Date
    2022-04-07
    Permanent link to this record
    http://hdl.handle.net/10754/676286
    
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    Abstract
    We present a study on the fabrication of tubular thin-film composite CMS membranes based on an intrinsically microporous polyimide of intrinsic microporosity (PIM-PI), PIM-6FDA-OH. Besides the inherent structural similarity between the PIM-PI and CMS membranes (i.e. microporosity with pores <20 Å), the unique feature of the chosen precursor is its ability to undergo a thermal rearrangement (TR) reaction which constitutes an additional mechanism of microporosity evolution in addition to the pyrolysis process. By using Raman spectroscopy and in-situ thermal spectroscopic ellipsometry we tracked the structural TR- and pyrolysis-related evolution in CMS films as thin as 100 nm. Our study revealed a pronounced acceleration of the microstructure collapse (densification) due to physical aging that occurred in ultra-thin films. These, and our previous findings, suggest that excessive reductions in selective layer thickness in microporous amorphous materials, such as PIMs or CMS, may not be beneficial to obtaining highly efficient membranes. Instead, we have shown that excellent and stable separation properties could be achieved by PIM-PI-derived CMS membranes with thicker, ∼3 μm, selective layers (e.g. CO2, H2 permeances of >200 GPU, with CO2/CH4, CO2/N2, and O2/N2 selectivities of 43.0, 41.0, and 7.5, respectively) even after 3 months of aging.
    Citation
    Ogieglo, W., Puspasari, T., Alabdulaaly, A., Nga Nguyen, T. P., Lai, Z., & Pinnau, I. (2022). Gas separation performance and physical aging of tubular thin-film composite carbon molecular sieve membranes based on a polyimide of intrinsic microporosity precursor. Journal of Membrane Science, 652, 120497. https://doi.org/10.1016/j.memsci.2022.120497
    Sponsors
    Supported by funding (BAS/1/1323-01-01) from King Abdullah University of Science and Technology.
    Publisher
    Elsevier BV
    Journal
    Journal of Membrane Science
    DOI
    10.1016/j.memsci.2022.120497
    Additional Links
    https://linkinghub.elsevier.com/retrieve/pii/S0376738822002447
    ae974a485f413a2113503eed53cd6c53
    10.1016/j.memsci.2022.120497
    Scopus Count
    Collections
    Articles; Advanced Membranes and Porous Materials Research Center; Physical Science and Engineering (PSE) Division; Chemical Engineering Program

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