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    Enhanced CO2 Adsorption and Selectivity of CO2/N2 on Amino-MIL-53(Al) Synthesized by Polar Co-solvents

    Access Status
    Fulltext not available
    Authors
    Abid, H.
    Rada, Z.
    Duan, Xiaoguang
    Sun, Hongqi
    Wang, Shaobin
    Date
    2018
    Type
    Journal Article
    
    Metadata
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    Citation
    Abid, H. and Rada, Z. and Duan, X. and Sun, H. and Wang, S. 2018. Enhanced CO2 Adsorption and Selectivity of CO2/N2 on Amino-MIL-53(Al) Synthesized by Polar Co-solvents. Energy and Fuels. 32 (4): pp. 4502-4510.
    Source Title
    Energy and Fuels
    DOI
    10.1021/acs.energyfuels.7b03240
    ISSN
    0887-0624
    School
    WASM: Minerals, Energy and Chemical Engineering (WASM-MECE)
    URI
    http://hdl.handle.net/20.500.11937/68161
    Collection
    • Curtin Research Publications
    Abstract

    Amino-MIL-53(Al) was solvothermally synthesized using co-solvents, such as methanol (M), ethanol (E), methanol/acetic acid (MA), or ethanol/acetic acid (EA), as modulators with dimethylformamide (D). The effects of co-solvents on physicochemical properties of amino-MIL-53(Al) were investigated. It was found that the addition of co-solvents in the synthesis leads to the reduction of crystallinity and crystal size of the samples. The textural properties, such as specific surface area and porous structure, were manipulated. Amino-MIL-53-DMA exhibited the highest Brunauer-Emmett-Teller surface area of 632 m 2 /g as a result of the loss of the bridging hydroxyl group, while amino-MIL-53, amino-MIL-53-DE, amino-MIL-53-DEA, and amino-MIL-53-DM presented the surface areas of 400, 356, 321, and 348 m 2 /g, respectively. However, the primary amine groups were maintained on the surface of all of the amino-MIL-53 samples. The co-solvents enhanced CO 2 adsorption on modified amino-MIL-53. CO 2 adsorption capacities on amino-MIL-53, amino-MIL-53-DM, amino-MIL-53-DE, amino-MIL-53-DEA, and amino-MIL-53-DMA are 48, 71, 67, 54, and 75 cm 3 /g, respectively, at standard conditions (1 atm and 273 K). CO 2 adsorption heat could be reduced to 24 kJ/mol on amino-MIL-53-DMA, giving it as a promising adsorbent for carbon dioxide storage at ambient conditions. Besides, the selectivity of CO 2 /N 2 on amino-MIL-53-DEA and amino-MIL-53-DE demonstrates an unprecedentedly separating factor of 637 at 1 atm and 273 K, whereas the separating factors of CO 2 /N 2 on amino-MIL-53, amino-MIL-53-DMA, and amino-MIL-53-DM are only 43, 43, and 153, respectively. Amino-MIL-53-DEA and amino-MIL-53-DE impressively outperform other MOFs and exhibit as an auspicious adsorbent for CO 2 /N 2 separation.

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