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Core-shell strain structure of zeolite microcrystals

Title
Core-shell strain structure of zeolite microcrystals
Authors
Cha, W.[Cha, Won Suk]Jeong, N.C.[Jeong, Nak Cheon]Song, S.[Song, Sang Hoon]Park, H.-J.[Park, Hyun Jun]Thanh Pham, T.C.[Thanh Pham, Tung Cao Ao]Harder, R.[Harder, Ross J.]Lim, B.[Lim, Bo Bae]Xiong, G.[Xiong, Gang]Ahn, D.[Ahn, Do Cheon]McNulty, I.[McNulty, Ian]Kim, J.[Kim, Jung Ho]Yoon, K.B.[Yoon, Kyung Byung]Robinson, I.K.[Robinson, Ian Keith]Kim, H.[Kim, Hyun Jung]
DGIST Authors
Jeong, N.C.[Jeong, Nak Cheon]
Issue Date
2013
Citation
Nature Materials, 12(8), 729-734
Type
Article
Article Type
Article
Keywords
Aluminosilicate MineralsCatalystsChemistryCoherent X-Ray Diffraction ImagingCore-Shell StructureCrystal StructureCrystallography, X-RayFluorescence MeasurementsMicrotechnologyMolecular SievesNegative Thermal ExpansionOrganic TemplatesStrainStrain StructureTemperatureThermal ExpansionTriangular DeformationX-Ray DiffractionX Ray CrystallographyX Ray DiffractionZeoliteZeolites
ISSN
1476-1122
Abstract
Zeolites are crystalline aluminosilicate minerals featuring a network of 0.3-1.5-nm-wide pores, used in industry as catalysts for hydrocarbon interconversion, ion exchangers, molecular sieves and adsorbents. For improved applications, it is highly useful to study the distribution of internal local strains because they sensitively affect the rates of adsorption and diffusion of guest molecules within zeolites. Here, we report the observation of an unusual triangular deformation field distribution in ZSM-5 zeolites by coherent X-ray diffraction imaging, showing the presence of a strain within the crystal arising from the heterogeneous core-shell structure, which is supported by finite element model calculation and confirmed by fluorescence measurement. The shell is composed of H-ZSM-5 with intrinsic negative thermal expansion whereas the core exhibits a different thermal expansion behaviour due to the presence of organic template residues, which usually remain when the starting materials are insufficiently calcined. Engineering such strain effects could have a major impact on the design of future catalysts. © 2013 Macmillan Publishers Limited. All rights reserved.
URI
http://hdl.handle.net/20.500.11750/3290
DOI
10.1038/nmat3698
Publisher
Nature Publishing Group
Files:
There are no files associated with this item.
Collection:
Emerging Materials ScienceETC1. Journal Articles


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