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Diffusion study by IR micro-imaging of molecular uptake and release on mesoporous zeolites of structure type CHA and LTA

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Title
Diffusion study by IR micro-imaging of molecular uptake and release on mesoporous zeolites of structure type CHA and LTA
Author(s)
Bonilla M.R.; Titze T.; Schmidt F.; Mehlhorn D.; Chmelik C.; Valiullin R.; Bhatia S.K.; Kaskel S.; Ryong Ryoo; Karger J.
Publication Date
2013-07
Journal
MATERIALS, v.6, no.7, pp.2662 - 2688
Publisher
MDPI AG
Abstract
The presence of mesopores in the interior of microporous particles may significantly improve their transport properties. Complementing previous macroscopic transient sorption experiments and pulsèd field gradient NMR self-diffusion studies with such materials, the present study is dedicated to an in-depth study of molecular uptake and release on the individual particles of mesoporous zeolitic specimens, notably with samples of the narrow-pore structure types, CHA and LTA. The investigations are focused on determining the time constants and functional dependences of uptake and release. They include a systematic variation of the architecture of the mesopores and of the guest molecules under study as well as a comparison of transient uptake with blocked and un-blocked mesopores. In addition to accelerating intracrystalline mass transfer, transport enhancement by mesopores is found to be, possibly, also caused by a reduction of transport resistances on the particle surfaces. © 2013 by the authors; licensee MDPI, Basel, Switzerland.
URI
http://pr.ibs.re.kr/handle/8788114/1583
DOI
10.3390/ma6072662
ISSN
1996-1944
Appears in Collections:
Center for Nanomaterials and Chemical Reactions(나노물질 및 화학반응 연구단) > Journal Papers (저널논문)
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