Epitaxially Grown Layered MFI–Bulk MFI Hybrid Zeolitic Materials

Handle URI:
http://hdl.handle.net/10754/598207
Title:
Epitaxially Grown Layered MFI–Bulk MFI Hybrid Zeolitic Materials
Authors:
Kim, Wun-gwi; Zhang, Xueyi; Lee, Jong Suk; Tsapatsis, Michael; Nair, Sankar
Abstract:
The synthesis of hybrid zeolitic materials with complex micropore-mesopore structures and morphologies is an expanding area of recent interest for a number of applications. Here we report a new type of hybrid zeolite material, composed of a layered zeolite material grown epitaxially on the surface of a bulk zeolite material. Specifically, layered (2-D) MFI sheets were grown on the surface of bulk MFI crystals of different sizes (300 nm and 10 μm), thereby resulting in a hybrid material containing a unique morphology of interconnected micropores (∼0.55 nm) and mesopores (∼3 nm). The structure and morphology of this material, referred to as a "bulk MFI-layered MFI" (BMLM) material, was elucidated by a combination of XRD, TEM, HRTEM, SEM, TGA, and N2 physisorption techniques. It is conclusively shown that epitaxial growth of the 2-D layered MFI sheets occurs in at least two principal crystallographic directions of the bulk MFI crystal and possibly in the third direction as well. The BMLM material combines the properties of bulk MFI (micropore network and mechanical support) and 2-D layered MFI (large surface roughness, external surface area, and mesoporosity). As an example of the uses of the BMLM material, it was incorporated into a polyimide and fabricated into a composite membrane with enhanced permeability for CO2 and good CO2/CH4 selectivity for gas separations. SEM-EDX imaging and composition analysis showed that the polyimide and the BMLM interpenetrate into each other, thereby forming a well-adhered polymer/particle microstructure, in contrast with the defective interfacial microstructure obtained using bare MFI particles. Analysis of the gas permeation data with the modified Maxwell model also allows the estimation of the effective volume of the BMLM particles, as well as the CO2 and CH4 gas permeabilities of the interpenetrated layer at the BMLM/polyimide interface. © 2012 American Chemical Society.
Citation:
Kim W, Zhang X, Lee JS, Tsapatsis M, Nair S (2012) Epitaxially Grown Layered MFI–Bulk MFI Hybrid Zeolitic Materials. ACS Nano 6: 9978–9988. Available: http://dx.doi.org/10.1021/nn3036254.
Publisher:
American Chemical Society (ACS)
Journal:
ACS Nano
KAUST Grant Number:
KUS-I1-011-21
Issue Date:
27-Nov-2012
DOI:
10.1021/nn3036254
PubMed ID:
23045956
Type:
Article
ISSN:
1936-0851; 1936-086X
Sponsors:
This publication is based on work supported by Award No. KUS-I1-011-21, made by King Abdullah University of Science and Technology (KAUST). M.T. and X.Z. acknowledge support from the Catalysis Center for Energy Innovation (award DESC00001004), an Energy Frontier Research Center funded by the U.S. Department of Energy, Office of Science, Office of Basic Energy Sciences. Portions of this work were conducted at the University of Minnesota Characterization Facility, which receives partial support from the National Science Foundation through the NNIN program. We also thank Prof. W. J. Koros (Georgia Tech) for helpful discussions and for proofreading the manuscript.
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Full metadata record

DC FieldValue Language
dc.contributor.authorKim, Wun-gwien
dc.contributor.authorZhang, Xueyien
dc.contributor.authorLee, Jong Suken
dc.contributor.authorTsapatsis, Michaelen
dc.contributor.authorNair, Sankaren
dc.date.accessioned2016-02-25T13:14:42Zen
dc.date.available2016-02-25T13:14:42Zen
dc.date.issued2012-11-27en
dc.identifier.citationKim W, Zhang X, Lee JS, Tsapatsis M, Nair S (2012) Epitaxially Grown Layered MFI–Bulk MFI Hybrid Zeolitic Materials. ACS Nano 6: 9978–9988. Available: http://dx.doi.org/10.1021/nn3036254.en
dc.identifier.issn1936-0851en
dc.identifier.issn1936-086Xen
dc.identifier.pmid23045956en
dc.identifier.doi10.1021/nn3036254en
dc.identifier.urihttp://hdl.handle.net/10754/598207en
dc.description.abstractThe synthesis of hybrid zeolitic materials with complex micropore-mesopore structures and morphologies is an expanding area of recent interest for a number of applications. Here we report a new type of hybrid zeolite material, composed of a layered zeolite material grown epitaxially on the surface of a bulk zeolite material. Specifically, layered (2-D) MFI sheets were grown on the surface of bulk MFI crystals of different sizes (300 nm and 10 μm), thereby resulting in a hybrid material containing a unique morphology of interconnected micropores (∼0.55 nm) and mesopores (∼3 nm). The structure and morphology of this material, referred to as a "bulk MFI-layered MFI" (BMLM) material, was elucidated by a combination of XRD, TEM, HRTEM, SEM, TGA, and N2 physisorption techniques. It is conclusively shown that epitaxial growth of the 2-D layered MFI sheets occurs in at least two principal crystallographic directions of the bulk MFI crystal and possibly in the third direction as well. The BMLM material combines the properties of bulk MFI (micropore network and mechanical support) and 2-D layered MFI (large surface roughness, external surface area, and mesoporosity). As an example of the uses of the BMLM material, it was incorporated into a polyimide and fabricated into a composite membrane with enhanced permeability for CO2 and good CO2/CH4 selectivity for gas separations. SEM-EDX imaging and composition analysis showed that the polyimide and the BMLM interpenetrate into each other, thereby forming a well-adhered polymer/particle microstructure, in contrast with the defective interfacial microstructure obtained using bare MFI particles. Analysis of the gas permeation data with the modified Maxwell model also allows the estimation of the effective volume of the BMLM particles, as well as the CO2 and CH4 gas permeabilities of the interpenetrated layer at the BMLM/polyimide interface. © 2012 American Chemical Society.en
dc.description.sponsorshipThis publication is based on work supported by Award No. KUS-I1-011-21, made by King Abdullah University of Science and Technology (KAUST). M.T. and X.Z. acknowledge support from the Catalysis Center for Energy Innovation (award DESC00001004), an Energy Frontier Research Center funded by the U.S. Department of Energy, Office of Science, Office of Basic Energy Sciences. Portions of this work were conducted at the University of Minnesota Characterization Facility, which receives partial support from the National Science Foundation through the NNIN program. We also thank Prof. W. J. Koros (Georgia Tech) for helpful discussions and for proofreading the manuscript.en
dc.publisherAmerican Chemical Society (ACS)en
dc.subjectepitaxial growthen
dc.subjecthybrid zeolitic materialsen
dc.subjectlayered MFIen
dc.subjectnanoporous materialsen
dc.subjectnanowhiskersen
dc.titleEpitaxially Grown Layered MFI–Bulk MFI Hybrid Zeolitic Materialsen
dc.typeArticleen
dc.identifier.journalACS Nanoen
dc.contributor.institutionGeorgia Institute of Technology, Atlanta, United Statesen
dc.contributor.institutionUniversity of Minnesota Twin Cities, Minneapolis, United Statesen
kaust.grant.numberKUS-I1-011-21en

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