Pressure-induced hydration and cation                             migration in a Cs+ exchanged gallosilicate                             zeolite LTL: Synchrotron X-ray powder diffraction study at ambient and                             high pressures

Donghoon Seoung; Yongjae Lee; Sun Jin Kim; Hyun Hwi Lee; Docheon Ahn; Nam Soo Shin; Thomas Vogt

doi:10.1016/j.micromeso.2010.07.023

Pressure-induced hydration and cation migration in a Cs⁺ exchanged gallosilicate zeolite LTL: Synchrotron X-ray powder diffraction study at ambient and high pressures

Donghoon Seoung, Yongjae Lee, Sun Jin Kim, Hyun Hwi Lee, Docheon Ahn, Nam Soo Shin, Thomas Vogt

Research output: Contribution to journal › Article › peer-review

5 Citations (Scopus)

Abstract

The ambient and high pressure structures of a partially cesium-exchanged K-gallosilicate with a zeolite LTL framework topology (Cs_0.65K _0.35-GaSi-LTL) was studied using synchrotron X-ray powder diffraction. In contrast to the cation distribution present in the aluminosilicate analogues, the larger cesium cations replace part of the potassium cations in the narrow 8-ring channel as well as in the main 12-ring channel of the gallosilicate LTL. Under hydrostatic pressures mediated by a pore-penetrating alcohol and water mixture, anomalous compression behavior is observed with a slight increase in the unit cell volume upon initial compression, i.e., 0.15% expansion at 0.44 GPa. This is the result of the continuous increase of the a-axis length up to 2 GPa and is found to be related to the gradual pressure-induced hydration (PIH) occurring inside the main 12-ring channel, where the water content increases from 15.9(1) H₂O at ambient conditions to 26.7(1) H₂O per formula unit at 2.83 GPa. During PIH, part of the cesium cations along the main 12-ring channel migrate into the narrow 8-ring channel. Compared to the structural changes observed in K-GaSi-LTL, the degree of pressure-induced hydration and the accompanying cation migration is found to be diminished in Cs_0.65K_0.35-GaSi- LTL.

Original language	English
Pages (from-to)	75-82
Number of pages	8
Journal	Microporous and Mesoporous Materials
Volume	136
Issue number	1-3
DOIs	https://doi.org/10.1016/j.micromeso.2010.07.023
Publication status	Published - 2010 Dec 1

Bibliographical note

Funding Information:
This work was supported by the National Research Foundation through the Nuclear R&D Program (Grant No. M2AM06-2008-03931 ). D. Seoung and Y. Lee thank the support from the BK21 program to the Institute of Earth, Atmosphere, and Astronomy at Yonsei University. Experiments at PAL were supported by Ministry of Education, Science and Technology of the Korean Government and POSTECH.

All Science Journal Classification (ASJC) codes

Chemistry(all)
Materials Science(all)
Condensed Matter Physics
Mechanics of Materials

Access to Document

10.1016/j.micromeso.2010.07.023

Cite this

Seoung, D., Lee, Y., Kim, S. J., Lee, H. H., Ahn, D., Shin, N. S., & Vogt, T. (2010). Pressure-induced hydration and cation migration in a Cs⁺ exchanged gallosilicate zeolite LTL: Synchrotron X-ray powder diffraction study at ambient and high pressures. Microporous and Mesoporous Materials, 136(1-3), 75-82. https://doi.org/10.1016/j.micromeso.2010.07.023

Seoung, Donghoon ; Lee, Yongjae ; Kim, Sun Jin et al. / Pressure-induced hydration and cation migration in a Cs⁺ exchanged gallosilicate zeolite LTL : Synchrotron X-ray powder diffraction study at ambient and high pressures. In: Microporous and Mesoporous Materials. 2010 ; Vol. 136, No. 1-3. pp. 75-82.

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abstract = "The ambient and high pressure structures of a partially cesium-exchanged K-gallosilicate with a zeolite LTL framework topology (Cs0.65K 0.35-GaSi-LTL) was studied using synchrotron X-ray powder diffraction. In contrast to the cation distribution present in the aluminosilicate analogues, the larger cesium cations replace part of the potassium cations in the narrow 8-ring channel as well as in the main 12-ring channel of the gallosilicate LTL. Under hydrostatic pressures mediated by a pore-penetrating alcohol and water mixture, anomalous compression behavior is observed with a slight increase in the unit cell volume upon initial compression, i.e., 0.15% expansion at 0.44 GPa. This is the result of the continuous increase of the a-axis length up to 2 GPa and is found to be related to the gradual pressure-induced hydration (PIH) occurring inside the main 12-ring channel, where the water content increases from 15.9(1) H2O at ambient conditions to 26.7(1) H2O per formula unit at 2.83 GPa. During PIH, part of the cesium cations along the main 12-ring channel migrate into the narrow 8-ring channel. Compared to the structural changes observed in K-GaSi-LTL, the degree of pressure-induced hydration and the accompanying cation migration is found to be diminished in Cs0.65K0.35-GaSi- LTL.",

author = "Donghoon Seoung and Yongjae Lee and Kim, {Sun Jin} and Lee, {Hyun Hwi} and Docheon Ahn and Shin, {Nam Soo} and Thomas Vogt",

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Seoung, D, Lee, Y, Kim, SJ, Lee, HH, Ahn, D, Shin, NS & Vogt, T 2010, 'Pressure-induced hydration and cation migration in a Cs⁺ exchanged gallosilicate zeolite LTL: Synchrotron X-ray powder diffraction study at ambient and high pressures', Microporous and Mesoporous Materials, vol. 136, no. 1-3, pp. 75-82. https://doi.org/10.1016/j.micromeso.2010.07.023

Pressure-induced hydration and cation migration in a Cs⁺ exchanged gallosilicate zeolite LTL : Synchrotron X-ray powder diffraction study at ambient and high pressures. / Seoung, Donghoon; Lee, Yongjae; Kim, Sun Jin et al.

In: Microporous and Mesoporous Materials, Vol. 136, No. 1-3, 01.12.2010, p. 75-82.

Research output: Contribution to journal › Article › peer-review

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AU - Lee, Hyun Hwi

AU - Ahn, Docheon

AU - Shin, Nam Soo

AU - Vogt, Thomas

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N2 - The ambient and high pressure structures of a partially cesium-exchanged K-gallosilicate with a zeolite LTL framework topology (Cs0.65K 0.35-GaSi-LTL) was studied using synchrotron X-ray powder diffraction. In contrast to the cation distribution present in the aluminosilicate analogues, the larger cesium cations replace part of the potassium cations in the narrow 8-ring channel as well as in the main 12-ring channel of the gallosilicate LTL. Under hydrostatic pressures mediated by a pore-penetrating alcohol and water mixture, anomalous compression behavior is observed with a slight increase in the unit cell volume upon initial compression, i.e., 0.15% expansion at 0.44 GPa. This is the result of the continuous increase of the a-axis length up to 2 GPa and is found to be related to the gradual pressure-induced hydration (PIH) occurring inside the main 12-ring channel, where the water content increases from 15.9(1) H2O at ambient conditions to 26.7(1) H2O per formula unit at 2.83 GPa. During PIH, part of the cesium cations along the main 12-ring channel migrate into the narrow 8-ring channel. Compared to the structural changes observed in K-GaSi-LTL, the degree of pressure-induced hydration and the accompanying cation migration is found to be diminished in Cs0.65K0.35-GaSi- LTL.

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Seoung D, Lee Y, Kim SJ, Lee HH, Ahn D, Shin NS et al. Pressure-induced hydration and cation migration in a Cs⁺ exchanged gallosilicate zeolite LTL: Synchrotron X-ray powder diffraction study at ambient and high pressures. Microporous and Mesoporous Materials. 2010 Dec 1;136(1-3):75-82. doi: 10.1016/j.micromeso.2010.07.023