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Diffusion Study by IR Micro-Imaging of Molecular Uptake and Release on Mesoporous Zeolites of Structure Type CHA and LTA.
- Source :
- Materials (1996-1944); Jul2013, Vol. 6 Issue 7, p2662-2688, 27p, 2 Black and White Photographs, 3 Charts, 6 Graphs
- Publication Year :
- 2013
-
Abstract
- The presence of mesopores in the interior of microporous particles may significantly improve their transport properties. Complementing previous macroscopic transient sorption experiments and pulsed 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. [ABSTRACT FROM AUTHOR]
- Subjects :
- DIFFUSION
INFRARED microscopy
ZEOLITES
ALKANES
ALKENES
Subjects
Details
- Language :
- English
- ISSN :
- 19961944
- Volume :
- 6
- Issue :
- 7
- Database :
- Complementary Index
- Journal :
- Materials (1996-1944)
- Publication Type :
- Academic Journal
- Accession number :
- 89444001
- Full Text :
- https://doi.org/10.3390/ma6072662