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Download filePorous Structure, Carbon Dioxide Capture, and Separation in Cross-Linked Porphyrin-Based Polyimides Networks
journal contribution
posted on 2019-07-26, 21:13 authored by Kaixiang Shi, Hongyan Yao, Shuai Zhang, Yanfeng Wei, Wenhan Xu, Ningning Song, Shiyang Zhu, Ye Tian, Yongcun Zou, Shaowei GuanThree cross-linked 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 cross-linking
reactions. Their chemical structures were confirmed by FTIR and 13C CP/MAS NMR. SEM, XRD, and TEM analyses were used to observe
their surface and nature characteristic morphologies as well as pore
channels. DSC and TGA were carried out to confirm their cross-linking
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).
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Keywords
1.2 nmCarbon Dioxide Captureuniform pore sizescoordination sitesPPBPI-CRpore channelsTAPPseparation factorssurface areasPPBPI-Fe-CRcross-linking behaviorsPorous StructureXRDCross-Linked Porphyrin-Based Polyimides NetworksDSCPEPHQDA273 KFTIRcross-linked porphyrin-based polyimideschemical structuresSEMCHCOPPBPI-H-CRCPNMRPPBPI-Mn-CRcross-linking reactions1 barTGATEM analyses