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  • Porous structure, carbon dioxide capture, and separation in cross-linked porphyrin-based polyimides networks
  • 来源:关绍巍教授个人网站 2020-03-05
  • Three crosslinked

    porphyrin-based polyimides (PPBPI-H-CR, PPBPI-Mn-CR and PPBPI-Fe-CR)

    were synthesized from

    5,10,15,20-tetra(4-aminophenyl)porphyrin (TAPP) and 2,5-bis(3,4-dicarboxyphenoxy)-4’-phenylethynyl-biphenyl

    dianhydride (PEPHQDA) via polymerization and thermal crosslinking reactions. Their

    chemical structures were confirmed by FTIR and 13C CP/MAS NMR. SEM,

    XRD and TEM were used to observe their surface

    and nature

    characteristic morphologies as well as pore channels. DSC and TGA were

    carried out to confirm their crosslinking behaviors

    and thermal stabilities.

    PPBPI-H-CR showed the largest specific surface area (733 m2 g-1)

    and the highest CO2 uptake (2.26 mmol g-1 at 273 K and 1

    bar) among the PPBPI-CRs. PPBPI-Mn-CR and PPBPI-Fe-CR compared to PPBPI-H-CR

    exhibited smaller specific surface areas, more uniform pore sizes around 1.2 nm

    and larger isosteric heats of

    adsorption due to the presence of coordination sites for manganese and iron. PPBPI-CRs

    exhibited separation factors of CO2/N2 (31.48,

    35.09 and 45.34) and CO2/CH4 (13.17, 9.06 and 12.99).

  • [来源:中国聚合物网]
  • 了解更多请进入: 关绍巍教授个人网站
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