Details
| Original language | English |
|---|---|
| Pages (from-to) | 151-157 |
| Number of pages | 7 |
| Journal | Microporous and Mesoporous Materials |
| Volume | 146 |
| Issue number | 1-3 |
| Early online date | 10 May 2011 |
| Publication status | Published - Dec 2011 |
Abstract
By PFG NMR diffusion measurements with short-chain length alkanes, the deposition of nano-sized LTA zeolite seed crystals on LTA single crystals and their secondary growth to surface layers is shown to reduce rather than to enhance transport resistances at the crystal surface. This, at first glance contra-intuitive, finding may be rationalised if the transport resistance on the external surface of the nanoporous crystals of the as-synthesized material results from an essentially impenetrable layer with highly dispersed structural defects rather than from a quasi-continuous layer with extremely low guest diffusivity and/or solubility: if accompanied with an - even very small - enhancement of the defect density, irrespective of the increasing layer thickness a subsequent surface treatment will enhance the surface permeability.
Keywords
- Diffusion, LTA, NMR, Permeability, Surface modification
ASJC Scopus subject areas
- Chemistry(all)
- Materials Science(all)
- Physics and Astronomy(all)
- Condensed Matter Physics
- Engineering(all)
- Mechanics of Materials
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In: Microporous and Mesoporous Materials, Vol. 146, No. 1-3, 12.2011, p. 151-157.
Research output: Contribution to journal › Article › Research › peer review
}
TY - JOUR
T1 - Surface permeability on zeolite NaCaA enhanced by layer deposition
AU - Binder, Tomas
AU - Adem, Ziad
AU - Krause, Cordula B.
AU - Krutyeva, Margarita
AU - Huang, Aisheng
AU - Caro, Jürgen
AU - Kärger, Jörg
PY - 2011/12
Y1 - 2011/12
N2 - By PFG NMR diffusion measurements with short-chain length alkanes, the deposition of nano-sized LTA zeolite seed crystals on LTA single crystals and their secondary growth to surface layers is shown to reduce rather than to enhance transport resistances at the crystal surface. This, at first glance contra-intuitive, finding may be rationalised if the transport resistance on the external surface of the nanoporous crystals of the as-synthesized material results from an essentially impenetrable layer with highly dispersed structural defects rather than from a quasi-continuous layer with extremely low guest diffusivity and/or solubility: if accompanied with an - even very small - enhancement of the defect density, irrespective of the increasing layer thickness a subsequent surface treatment will enhance the surface permeability.
AB - By PFG NMR diffusion measurements with short-chain length alkanes, the deposition of nano-sized LTA zeolite seed crystals on LTA single crystals and their secondary growth to surface layers is shown to reduce rather than to enhance transport resistances at the crystal surface. This, at first glance contra-intuitive, finding may be rationalised if the transport resistance on the external surface of the nanoporous crystals of the as-synthesized material results from an essentially impenetrable layer with highly dispersed structural defects rather than from a quasi-continuous layer with extremely low guest diffusivity and/or solubility: if accompanied with an - even very small - enhancement of the defect density, irrespective of the increasing layer thickness a subsequent surface treatment will enhance the surface permeability.
KW - Diffusion
KW - LTA
KW - NMR
KW - Permeability
KW - Surface modification
UR - http://www.scopus.com/inward/record.url?scp=80052493215&partnerID=8YFLogxK
U2 - 10.1016/j.micromeso.2011.04.037
DO - 10.1016/j.micromeso.2011.04.037
M3 - Article
AN - SCOPUS:80052493215
VL - 146
SP - 151
EP - 157
JO - Microporous and Mesoporous Materials
JF - Microporous and Mesoporous Materials
SN - 1387-1811
IS - 1-3
ER -