Details
| Original language | English |
|---|---|
| Pages (from-to) | 244-250 |
| Number of pages | 7 |
| Journal | Microporous and Mesoporous Materials |
| Volume | 99 |
| Issue number | 3 |
| Publication status | Published - 7 Nov 2006 |
Abstract
The inner-surface properties of zeolite A (LTA) were modified by the exchange of the charge-balancing non-framework cations (Li+, Na+, K+, Rb+, and Cs+). Molecular iodine, sorbed from the vapor phase, was used to probe these properties. The structure of molecular iodine, introduced via the vapour phase, is changed by these surface properties. Our results, based on techniques allowing access to the geometric (X-ray absorption fine structure), electronic (UV-Vis spectroscopy) and vibrational structure (Raman spectroscopy) of the iodine molecule show that the intercalated molecules located at the inner surface of the zeolite are strongly influenced by the electric fields determined by the cations (Li+, Na+, K+, Rb+, and Cs+). EXAFS and UV-Vis spectroscopy reveal changes in the average bond distances and the electronic structure. Interestingly, in Rb- and Cs-exchanged zeolites, triiodide anions are apparently formed. Since all of the observed changes can be related to the cations present in the cages, we can thus demonstrate that iodine is influenced by the inner surface properties of zeolites.
Keywords
- EXAFS, Iodine, Porous materials, Raman-spectroscopy, UV-Vis spectroscopy, Zeolites
ASJC Scopus subject areas
- Chemistry(all)
- General Chemistry
- Materials Science(all)
- General Materials Science
- Physics and Astronomy(all)
- Condensed Matter Physics
- Engineering(all)
- Mechanics of Materials
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In: Microporous and Mesoporous Materials, Vol. 99, No. 3, 07.11.2006, p. 244-250.
Research output: Contribution to journal › Article › Research › peer review
}
TY - JOUR
T1 - The structural change of intercalated iodine determined by the inner surface properties of ion-exchanged zeolite A
AU - Basch, Angelika
AU - Hartl, Monika
AU - Behrens, Peter
N1 - Funding information: We thank the HASYLAB Hamburg for providing their facilities and for their support during the EXAFS measurement and Dr. Georg Raber (University of Graz, Austria) for AAS measurements. Furthermore, we thank Prof. Alois Popitsch (University of Graz, Austria) and Prof. Karl Gatterer (Graz University of Technology, Austria) for useful discussions. The work in Hannover was supported by the Fonds der Chemischen Industrie.
PY - 2006/11/7
Y1 - 2006/11/7
N2 - The inner-surface properties of zeolite A (LTA) were modified by the exchange of the charge-balancing non-framework cations (Li+, Na+, K+, Rb+, and Cs+). Molecular iodine, sorbed from the vapor phase, was used to probe these properties. The structure of molecular iodine, introduced via the vapour phase, is changed by these surface properties. Our results, based on techniques allowing access to the geometric (X-ray absorption fine structure), electronic (UV-Vis spectroscopy) and vibrational structure (Raman spectroscopy) of the iodine molecule show that the intercalated molecules located at the inner surface of the zeolite are strongly influenced by the electric fields determined by the cations (Li+, Na+, K+, Rb+, and Cs+). EXAFS and UV-Vis spectroscopy reveal changes in the average bond distances and the electronic structure. Interestingly, in Rb- and Cs-exchanged zeolites, triiodide anions are apparently formed. Since all of the observed changes can be related to the cations present in the cages, we can thus demonstrate that iodine is influenced by the inner surface properties of zeolites.
AB - The inner-surface properties of zeolite A (LTA) were modified by the exchange of the charge-balancing non-framework cations (Li+, Na+, K+, Rb+, and Cs+). Molecular iodine, sorbed from the vapor phase, was used to probe these properties. The structure of molecular iodine, introduced via the vapour phase, is changed by these surface properties. Our results, based on techniques allowing access to the geometric (X-ray absorption fine structure), electronic (UV-Vis spectroscopy) and vibrational structure (Raman spectroscopy) of the iodine molecule show that the intercalated molecules located at the inner surface of the zeolite are strongly influenced by the electric fields determined by the cations (Li+, Na+, K+, Rb+, and Cs+). EXAFS and UV-Vis spectroscopy reveal changes in the average bond distances and the electronic structure. Interestingly, in Rb- and Cs-exchanged zeolites, triiodide anions are apparently formed. Since all of the observed changes can be related to the cations present in the cages, we can thus demonstrate that iodine is influenced by the inner surface properties of zeolites.
KW - EXAFS
KW - Iodine
KW - Porous materials
KW - Raman-spectroscopy
KW - UV-Vis spectroscopy
KW - Zeolites
UR - http://www.scopus.com/inward/record.url?scp=33846144180&partnerID=8YFLogxK
U2 - 10.1016/j.micromeso.2006.09.022
DO - 10.1016/j.micromeso.2006.09.022
M3 - Article
AN - SCOPUS:33846144180
VL - 99
SP - 244
EP - 250
JO - Microporous and Mesoporous Materials
JF - Microporous and Mesoporous Materials
SN - 1387-1811
IS - 3
ER -