Porous structure, carbon dioxide capture, and separation in cross-linked porphyrin-based polyimides networks
writer：關(guān)紹巍
keywords：交聯(lián)反應(yīng)，多孔結(jié)構(gòu)
source：期刊
Issue time：2019年
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).