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dc.contributor.authorMukaddam, Mohsin Ahmed
dc.contributor.authorWang, Yingge
dc.contributor.authorPinnau, Ingo
dc.date.accessioned2018-09-03T13:19:21Z
dc.date.available2018-09-03T13:19:21Z
dc.date.issued2018-07-06
dc.identifier.citationMukaddam M, Wang Y, Pinnau I (2018) Structural, Thermal, and Gas-Transport Properties of Fe3+ Ion-Exchanged Nafion Membranes. ACS Omega 3: 7474–7482. Available: http://dx.doi.org/10.1021/acsomega.8b00914.
dc.identifier.issn2470-1343
dc.identifier.issn2470-1343
dc.identifier.doi10.1021/acsomega.8b00914
dc.identifier.urihttp://hdl.handle.net/10754/628375
dc.description.abstractThe physical and gas-transport properties of Fe3+ cross-linked Nafion membranes were examined. Wide-angle X-ray diffraction results revealed a lower crystallinity for Nafion Fe3+ but showed essentially no changes in the average chain spacing upon cation exchange of Nafion H+. Raman and Fourier transform infrared spectroscopy techniques qualitatively measured the strength of the ionic bond between the Fe3+ cations and sulfonate anions. Thermal gravimetric analysis indicated that the incorporation of Fe3+ adversely affected the thermal stability of Nafion due to the catalytic decomposition of perfluoroalkylether side chains. Gas sorption isotherms of Nafion Fe3+ measured at 35 °C up to 20 atm exhibited a linear sorption uptake for O2, N2, and CH4 following Henry’s law and slight concave behavior for CO2. Pure-gas permeation results showed reduced gas permeability but higher permselectivities compared to Nafion H+ with αN2/CH4 = 4.0, αCO2/CH4 = 35, and αHe/CH4 = 733 attributable to the strong physical cross-linking effect of Fe3+ that caused chain stiffening with enhanced size-sieving behavior. Gas mixture permeation experiments using 1:1 molar CO2/CH4 feed demonstrated reduced CO2 plasticization for Nafion Fe3+. At 10 atm CO2 partial pressure, CO2/CH4 selectivity decreased to 28 from the pure-gas value of 35, which was a significant improvement compared to the performance of a Nafion H+ membrane.
dc.description.sponsorshipThis work was supported by funding from King Abdullah University of Science and Technology (KAUST).
dc.publisherAmerican Chemical Society (ACS)
dc.relation.urlhttps://pubs.acs.org/doi/full/10.1021/acsomega.8b00914
dc.rightsThis is an open access article published under an ACS AuthorChoice License, which permits copying and redistribution of the article or any adaptations for non-commercial purposes.
dc.rights.urihttp://pubs.acs.org/page/policy/authorchoice_termsofuse.html
dc.titleStructural, Thermal, and Gas-Transport Properties of Fe3+ Ion-Exchanged Nafion Membranes
dc.typeArticle
dc.contributor.departmentAdvanced Membranes and Porous Materials Research Center
dc.contributor.departmentChemical Engineering Program
dc.contributor.departmentMaterial Science and Engineering Program
dc.contributor.departmentPhysical Science and Engineering (PSE) Division
dc.identifier.journalACS Omega
dc.eprint.versionPublisher's Version/PDF
kaust.personMukaddam, Mohsin Ahmed
kaust.personWang, Yingge
kaust.personPinnau, Ingo
refterms.dateFOA2018-09-12T06:28:04Z
dc.date.published-online2018-07-06
dc.date.published-print2018-07-31


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