Fabrication and Molecular Transport Studies of Highly c-Oriented AFI Membranes

Handle URI:
http://hdl.handle.net/10754/622676
Title:
Fabrication and Molecular Transport Studies of Highly c-Oriented AFI Membranes
Authors:
Liu, Yang; Zhang, Bing; Liu, Defei; Sheng, Ping; Lai, Zhiping ( 0000-0001-9555-6009 )
Abstract:
The AFI membrane with one-dimensional straight channels is an ideal platform for various applications. In this work, we report the fabrication of a highly c-oriented, compact and stable AFI membrane by epitaxial growth from an almost close-packed and c-oriented monolayer of plate-like seeds that is manually assembled on a porous alumina support. The straight channels in the membrane are not only aligned vertically along the membrane depth, but are also continuous without disruption. The transport resistance is thus minimized and as a result, the membrane shows almost two orders of magnitude greater permeance in pervaporation of hydrocarbons compared to reported values in the literature. The selectivity of p-xylene to 1,3,5-triisopropylbenzene (TIPB) is approximately 850. In addition, through gas permeation studies on a number of gas and liquid molecules, different transport mechanisms including activated Knudsen diffusion, surface diffusion and molecular sieving were discovered for different diffusion species. The ratio of kinetic diameter to channel diameter, dm/dc, and the ratio of the Lennard-Jones length constant to channel diameter, σm/dc, are found very useful in explaining the different transport behaviors. These results should be useful not only for potential industrial applications of the AFI membranes but also for the fundamental understanding of transport in nanoporous structures.
KAUST Department:
Advanced Membranes and Porous Materials Research Center; Chemical and Biological Engineering Program; Physical Sciences and Engineering (PSE) Division
Citation:
Liu Y, Zhang B, Liu D, Sheng P, Lai Z (2017) Fabrication and Molecular Transport Studies of Highly c-Oriented AFI Membranes. Journal of Membrane Science. Available: http://dx.doi.org/10.1016/j.memsci.2017.01.012.
Publisher:
Elsevier BV
Journal:
Journal of Membrane Science
KAUST Grant Number:
URF/1/1723
Issue Date:
10-Jan-2017
DOI:
10.1016/j.memsci.2017.01.012
Type:
Article
ISSN:
0376-7388
Sponsors:
The work was funded by the KAUST competitive grant URF/1/1723.
Additional Links:
http://www.sciencedirect.com/science/article/pii/S0376738816317811
Appears in Collections:
Articles; Advanced Membranes and Porous Materials Research Center; Physical Sciences and Engineering (PSE) Division; Chemical and Biological Engineering Program

Full metadata record

DC FieldValue Language
dc.contributor.authorLiu, Yangen
dc.contributor.authorZhang, Bingen
dc.contributor.authorLiu, Defeien
dc.contributor.authorSheng, Pingen
dc.contributor.authorLai, Zhipingen
dc.date.accessioned2017-01-11T12:20:30Z-
dc.date.available2017-01-11T12:20:30Z-
dc.date.issued2017-01-10en
dc.identifier.citationLiu Y, Zhang B, Liu D, Sheng P, Lai Z (2017) Fabrication and Molecular Transport Studies of Highly c-Oriented AFI Membranes. Journal of Membrane Science. Available: http://dx.doi.org/10.1016/j.memsci.2017.01.012.en
dc.identifier.issn0376-7388en
dc.identifier.doi10.1016/j.memsci.2017.01.012en
dc.identifier.urihttp://hdl.handle.net/10754/622676-
dc.description.abstractThe AFI membrane with one-dimensional straight channels is an ideal platform for various applications. In this work, we report the fabrication of a highly c-oriented, compact and stable AFI membrane by epitaxial growth from an almost close-packed and c-oriented monolayer of plate-like seeds that is manually assembled on a porous alumina support. The straight channels in the membrane are not only aligned vertically along the membrane depth, but are also continuous without disruption. The transport resistance is thus minimized and as a result, the membrane shows almost two orders of magnitude greater permeance in pervaporation of hydrocarbons compared to reported values in the literature. The selectivity of p-xylene to 1,3,5-triisopropylbenzene (TIPB) is approximately 850. In addition, through gas permeation studies on a number of gas and liquid molecules, different transport mechanisms including activated Knudsen diffusion, surface diffusion and molecular sieving were discovered for different diffusion species. The ratio of kinetic diameter to channel diameter, dm/dc, and the ratio of the Lennard-Jones length constant to channel diameter, σm/dc, are found very useful in explaining the different transport behaviors. These results should be useful not only for potential industrial applications of the AFI membranes but also for the fundamental understanding of transport in nanoporous structures.en
dc.description.sponsorshipThe work was funded by the KAUST competitive grant URF/1/1723.en
dc.publisherElsevier BVen
dc.relation.urlhttp://www.sciencedirect.com/science/article/pii/S0376738816317811en
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, 10 January 2017. DOI: 10.1016/j.memsci.2017.01.012.en
dc.subjectAFIen
dc.subjectZeolite Membraneen
dc.subjectTransport Mechanismen
dc.subjectNanoporesen
dc.titleFabrication and Molecular Transport Studies of Highly c-Oriented AFI Membranesen
dc.typeArticleen
dc.contributor.departmentAdvanced Membranes and Porous Materials Research Centeren
dc.contributor.departmentChemical and Biological Engineering Programen
dc.contributor.departmentPhysical Sciences and Engineering (PSE) Divisionen
dc.identifier.journalJournal of Membrane Scienceen
dc.eprint.versionPost-printen
dc.contributor.institutionDepartment of Physics, Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, Hong Kongen
kaust.authorLiu, Yangen
kaust.authorLiu, Defeien
kaust.authorLai, Zhipingen
kaust.grant.numberURF/1/1723en
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