Details
| Original language | English |
|---|---|
| Pages (from-to) | 3-10 |
| Number of pages | 8 |
| Journal | Microporous and Mesoporous Materials |
| Volume | 110 |
| Issue number | 1 |
| Publication status | Published - 10 Aug 2007 |
Abstract
Zeolitic membranes based on the sodalite structure are of special interest for the separation of very small atoms and molecules (He, H2, H2O, NH3). The two-step technique for the preparation of zeolitic membranes requires first the synthesis of suitable nanocrystals which act as seed crystals in the second step, the preparation of membrane. This work deals with the possibilities of synthesizing crystalline nanoparticles of pure silica sodalites and of aluminosilicate sodalites with a high Si:Al ratio. In the case of silica sodalites prepared with different neutral organic molecules as structure-directing agents, preparation of nanocrystals proved difficult and was possible only with low yields in a tedious process. With the tetramethylammonium cation (TMA) as structure-directing agent, aluminosilicate sodalite with idealized framework Si:Al ratio of 5:1 can be obtained as colloidal suspensions of nanocrystalline sodalite from a clear solution. By changing the reaction conditions from hydrothermal to an open reaction system, it is possible to generate sodalite nanocrystals in high yield. The characterization of these nanoparticles was done via dynamic light scattering, X-ray powder diffraction and high resolution scanning electron microscopy. The aluminosilicate sodalite nanocrystals thus produced can be used as seed crystals in the preparation of silica sodalite crystals with varying Si:Al ratios.
Keywords
- Colloidal zeolite, Dynamic light scattering, Seed crystals, Two-step crystallization, Zeolite membrane
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. 110, No. 1, 10.08.2007, p. 3-10.
Research output: Contribution to journal › Article › Research › peer review
}
TY - JOUR
T1 - Preparation and characterization of sodium-free nanocrystalline sodalite
AU - Münzer, Simon
AU - Caro, Jürgen
AU - Behrens, Peter
PY - 2007/8/10
Y1 - 2007/8/10
N2 - Zeolitic membranes based on the sodalite structure are of special interest for the separation of very small atoms and molecules (He, H2, H2O, NH3). The two-step technique for the preparation of zeolitic membranes requires first the synthesis of suitable nanocrystals which act as seed crystals in the second step, the preparation of membrane. This work deals with the possibilities of synthesizing crystalline nanoparticles of pure silica sodalites and of aluminosilicate sodalites with a high Si:Al ratio. In the case of silica sodalites prepared with different neutral organic molecules as structure-directing agents, preparation of nanocrystals proved difficult and was possible only with low yields in a tedious process. With the tetramethylammonium cation (TMA) as structure-directing agent, aluminosilicate sodalite with idealized framework Si:Al ratio of 5:1 can be obtained as colloidal suspensions of nanocrystalline sodalite from a clear solution. By changing the reaction conditions from hydrothermal to an open reaction system, it is possible to generate sodalite nanocrystals in high yield. The characterization of these nanoparticles was done via dynamic light scattering, X-ray powder diffraction and high resolution scanning electron microscopy. The aluminosilicate sodalite nanocrystals thus produced can be used as seed crystals in the preparation of silica sodalite crystals with varying Si:Al ratios.
AB - Zeolitic membranes based on the sodalite structure are of special interest for the separation of very small atoms and molecules (He, H2, H2O, NH3). The two-step technique for the preparation of zeolitic membranes requires first the synthesis of suitable nanocrystals which act as seed crystals in the second step, the preparation of membrane. This work deals with the possibilities of synthesizing crystalline nanoparticles of pure silica sodalites and of aluminosilicate sodalites with a high Si:Al ratio. In the case of silica sodalites prepared with different neutral organic molecules as structure-directing agents, preparation of nanocrystals proved difficult and was possible only with low yields in a tedious process. With the tetramethylammonium cation (TMA) as structure-directing agent, aluminosilicate sodalite with idealized framework Si:Al ratio of 5:1 can be obtained as colloidal suspensions of nanocrystalline sodalite from a clear solution. By changing the reaction conditions from hydrothermal to an open reaction system, it is possible to generate sodalite nanocrystals in high yield. The characterization of these nanoparticles was done via dynamic light scattering, X-ray powder diffraction and high resolution scanning electron microscopy. The aluminosilicate sodalite nanocrystals thus produced can be used as seed crystals in the preparation of silica sodalite crystals with varying Si:Al ratios.
KW - Colloidal zeolite
KW - Dynamic light scattering
KW - Seed crystals
KW - Two-step crystallization
KW - Zeolite membrane
UR - http://www.scopus.com/inward/record.url?scp=38949183022&partnerID=8YFLogxK
U2 - 10.1016/j.micromeso.2007.07.040
DO - 10.1016/j.micromeso.2007.07.040
M3 - Article
AN - SCOPUS:38949183022
VL - 110
SP - 3
EP - 10
JO - Microporous and Mesoporous Materials
JF - Microporous and Mesoporous Materials
SN - 1387-1811
IS - 1
ER -