Details
| Original language | English |
|---|---|
| Pages (from-to) | 53-61 |
| Number of pages | 9 |
| Journal | Microporous and Mesoporous Materials |
| Volume | 90 |
| Issue number | 1-3 SPEC. ISS. |
| Early online date | 27 Dec 2005 |
| Publication status | Published - 20 Mar 2006 |
Abstract
A critical replication and re-evaluation of Charnell's procedure to the synthesis of zeolites A and X has been carried out, aiming at reliable protocols for preparation of large and uniform crystals of the respective zeolites in a scale of 50 g per batch. Triethanolamine, as an organic additive to the reacting sodium aluminosilicate hydrogel, increases the viscosity of the system, and reduces the reactivity of aluminium species towards nucleation and crystal growth through forming chelated complex compounds. The reactivity of silicate species has to be accordingly adjusted, by choosing proper source materials. Zeolite A crystals, which possess shapes of edge-truncated cubes, and sizes of 35-40 μm in edge-length, have been synthesized with a starting gel having the composition 1.7Na2O:Al2O 3:0.7SiO2:165H2O:6.1TEA in 2-l batch-size, using dissolved metallic aluminium and colloidal silica. The crystallization has been accomplished at 85 °C within 21 days. When the gel has a starting composition 2.3Na2O:Al2O3:1.3SiO 2:300H2O:10TEA (1-l batch), 70-80 μm large zeolite X crystals can be obtained at 85 °C in 35 days. Both starting gels are prepared at 0 °C, then quickly heated to the crystallization temperature.
Keywords
- Charnell's procedure, Growth of large crystals, Optimized synthesis, Triethanolamine additive, Zeolite A, Zeolite X
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. 90, No. 1-3 SPEC. ISS., 20.03.2006, p. 53-61.
Research output: Contribution to journal › Article › Research › peer review
}
TY - JOUR
T1 - Revision of Charnell's procedure towards the synthesis of large and uniform crystals of zeolites A and X
AU - Yang, Xiaobo
AU - Albrecht, Daniel
AU - Caro, Jürgen
PY - 2006/3/20
Y1 - 2006/3/20
N2 - A critical replication and re-evaluation of Charnell's procedure to the synthesis of zeolites A and X has been carried out, aiming at reliable protocols for preparation of large and uniform crystals of the respective zeolites in a scale of 50 g per batch. Triethanolamine, as an organic additive to the reacting sodium aluminosilicate hydrogel, increases the viscosity of the system, and reduces the reactivity of aluminium species towards nucleation and crystal growth through forming chelated complex compounds. The reactivity of silicate species has to be accordingly adjusted, by choosing proper source materials. Zeolite A crystals, which possess shapes of edge-truncated cubes, and sizes of 35-40 μm in edge-length, have been synthesized with a starting gel having the composition 1.7Na2O:Al2O 3:0.7SiO2:165H2O:6.1TEA in 2-l batch-size, using dissolved metallic aluminium and colloidal silica. The crystallization has been accomplished at 85 °C within 21 days. When the gel has a starting composition 2.3Na2O:Al2O3:1.3SiO 2:300H2O:10TEA (1-l batch), 70-80 μm large zeolite X crystals can be obtained at 85 °C in 35 days. Both starting gels are prepared at 0 °C, then quickly heated to the crystallization temperature.
AB - A critical replication and re-evaluation of Charnell's procedure to the synthesis of zeolites A and X has been carried out, aiming at reliable protocols for preparation of large and uniform crystals of the respective zeolites in a scale of 50 g per batch. Triethanolamine, as an organic additive to the reacting sodium aluminosilicate hydrogel, increases the viscosity of the system, and reduces the reactivity of aluminium species towards nucleation and crystal growth through forming chelated complex compounds. The reactivity of silicate species has to be accordingly adjusted, by choosing proper source materials. Zeolite A crystals, which possess shapes of edge-truncated cubes, and sizes of 35-40 μm in edge-length, have been synthesized with a starting gel having the composition 1.7Na2O:Al2O 3:0.7SiO2:165H2O:6.1TEA in 2-l batch-size, using dissolved metallic aluminium and colloidal silica. The crystallization has been accomplished at 85 °C within 21 days. When the gel has a starting composition 2.3Na2O:Al2O3:1.3SiO 2:300H2O:10TEA (1-l batch), 70-80 μm large zeolite X crystals can be obtained at 85 °C in 35 days. Both starting gels are prepared at 0 °C, then quickly heated to the crystallization temperature.
KW - Charnell's procedure
KW - Growth of large crystals
KW - Optimized synthesis
KW - Triethanolamine additive
KW - Zeolite A
KW - Zeolite X
UR - http://www.scopus.com/inward/record.url?scp=32644450554&partnerID=8YFLogxK
U2 - 10.1016/j.micromeso.2005.10.044
DO - 10.1016/j.micromeso.2005.10.044
M3 - Article
AN - SCOPUS:32644450554
VL - 90
SP - 53
EP - 61
JO - Microporous and Mesoporous Materials
JF - Microporous and Mesoporous Materials
SN - 1387-1811
IS - 1-3 SPEC. ISS.
ER -