| 학회 |
한국화학공학회 |
| 학술대회 |
2003년 봄 (04/25 ~ 04/26, 순천대학교) |
| 권호 |
9권 1호, p.1135 |
| 발표분야 |
촉매/반응공학 |
| 제목 |
Non-framework cation migration and irreversible pressure-induced hydration in zeolite |
| 초록 |
Zeolite crystallizes in a variety of three-dimensional structures in which oxygen atoms are shared between tetrahedra containing silicon and/or aluminum, thus yielding negatively charged tetrahedral frameworks that enclose cavities and pores of molecular dimensions occupied by charge-balancing metal cations and water molecules. Cation migration in the pores and changes in water content associated with concomitant relaxation of the framework have been observed in numerous variable-temperature studies, whereas the effects of hydrostatic pressure on the structure and properties of zeolites are less well explored. The zeolite sodium aluminosilicate natrolite was recently shown to undergo a volume expansion at pressures above 1.2 GPa as a result of reversible pressure-induced hydration; in contrast, a synthetic analogue, potassium gallosilicate natrolite, exhibited irreversible pressure-induced hydration with retention of the high-pressure phase at ambient conditions. Here we report the structure of the high-pressure recovered phase. |
| 저자 |
김선진1, Y. Lee2, T. Vogt2, J. A. Hriljac3, J. B. Parise4, J. C. Hanson2
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| 소속 |
1KIST, 2Boookhaven National Laboratory, 3Univ. of Birmingham, 4State Univ. of New York |
| 키워드 |
Zeolite; Non-framework cation; Pressure-induced hydration
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| E-Mail |
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| VOD |
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