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dc.contributor.authorHazazi, Khalid
dc.contributor.authorMa, Xiaohua
dc.contributor.authorWang, Yingge
dc.contributor.authorOgieglo, Wojciech
dc.contributor.authorAlhazmi, Abdulrahman
dc.contributor.authorHan, Yu
dc.contributor.authorPinnau, Ingo
dc.date.accessioned2019-05-14T12:53:22Z
dc.date.available2019-05-14T12:53:22Z
dc.date.issued2019-05-10
dc.identifier.citationHazazi K, Ma X, Wang Y, Ogieglo W, Alhazmi A, et al. (2019) Ultra-selective carbon molecular sieve membranes for natural gas separations based on a carbon-rich intrinsically microporous polyimide precursor. Journal of Membrane Science. Available: http://dx.doi.org/10.1016/j.memsci.2019.05.020.
dc.identifier.issn0376-7388
dc.identifier.doi10.1016/j.memsci.2019.05.020
dc.identifier.urihttp://hdl.handle.net/10754/652881
dc.description.abstractA highly contorted, carbon-rich intrinsically microporous polyimide (PIM-PI) made from spirobifluorene dianhydride and 3,3-dimethylnaphthidine (SBFDA-DMN) was employed as a precursor for the formation of carbon molecular sieve (CMS) membranes at pyrolysis temperatures from 550 to 1000 °C. The high carbon content of SBFDA-DMN (∼84%) resulted in only 28% total weight loss during pyrolysis under a nitrogen atmosphere at 1000 °C. The development of the various microstructural textures was characterized by gas sorption analysis, Brunauer-Emmett-Teller (BET) surface area, X-ray diffraction, Raman spectroscopy, electrical conductivity, and gas transport properties. Heat treatment of a pristine SBFDA-DMN membrane at 550 °C resulted in reduced permeability for all gases (e.g.: PCO2 dropped from 4700 to 1500 barrer) as well as lower BET surface area from 621 to 545 m2 g−1. At 600 °C, new pores induced by pyrolysis increased the BET surface area to nearly that of the precursor and significantly improved gas separation performance. Above 600 °C, a progressive collapse of the micropores became evident with CMS membranes showing higher gas-pair selectivity but lower permeability. At 1000 °C, ultra-micropores comparable in size with the kinetic diameter of CH4 emerged and induced a prominent molecular sieving effect resulting in very high CH4 rejection. This strong size exclusion effect, further supported by gravimetric gas sorption measurements, resulted in unusually high N2/CH4 and CO2/CH4 selectivities of 35 and 1475, respectively.
dc.description.sponsorshipThis research was supported by funding (BAS/1/13223-01-01) from King Abdullah University of Science and Technology.
dc.publisherElsevier BV
dc.relation.urlhttps://www.sciencedirect.com/science/article/pii/S0376738819307070
dc.rightsNOTICE: this is the author’s version of a work that was accepted for publication in Journal of Membrane Science. Changes resulting from the publishing process, such as peer review, editing, corrections, structural formatting, and other quality control mechanisms may not be reflected in this document. Changes may have been made to this work since it was submitted for publication. A definitive version was subsequently published in Journal of Membrane Science, [, , (2019-05-10)] DOI: 10.1016/j.memsci.2019.05.020 . © 2019. This manuscript version is made available under the CC-BY-NC-ND 4.0 license http://creativecommons.org/licenses/by-nc-nd/4.0/
dc.titleUltra-selective carbon molecular sieve membranes for natural gas separations based on a carbon-rich intrinsically microporous polyimide precursor
dc.typeArticle
dc.contributor.departmentPhysical Sciences and Engineering (PSE) Division
dc.contributor.departmentChemical and Biological Engineering Program
dc.contributor.departmentAdvanced Membranes and Porous Materials Research Center
dc.contributor.departmentChemical Science Program
dc.contributor.departmentFunctional Polymer Membranes Group, Thuwal, 23955, Saudi Arabia
dc.identifier.journalJournal of Membrane Science
dc.eprint.versionPost-print
kaust.personHazazi, Khalid
kaust.personMa, Xiaohua
kaust.personWang, Yingge
kaust.personOgieglo, Wojciech
kaust.personAlhazmi, Abdulrahman
kaust.personHan, Yu
kaust.personPinnau, Ingo
kaust.grant.numberBAS/1/13223-01-01


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