| 학회 |
한국화학공학회 |
| 학술대회 |
2008년 가을 (10/23 ~ 10/24, 부산 BEXCO) |
| 권호 |
14권 2호, p.3530 |
| 발표분야 |
촉매 및 반응공학 |
| 제목 |
Synthesis of Gallosilicate Gonnardite Zeolite and Its Transformation to KAlGeO4-Type Kalsilite |
| 초록 |
A gallosilicate analog of the natural zeolite gonnardite with the NAT topology and with complete disorder in tetrahedral sites has been hydrothermally synthesized in the presence of K+ ions as a structure-directing agent. This material denoted as PST-1 was found to rapidly transform into the gallosilicate analog of kalsilite with the KAlGeO4-type hexagonal unit cell, named TNU-6, with prolonged heating in the crystallization medium. Analysis of both the synchrotron powder and single crystal diffranction data reveals the existence of an additional √3a superstructure in TNU-6 generated by tilting of some of the tetrahedral units in all 6-membered rings. In situ high-temperature powder X-ray diffraction experiments shows that PST-1 transforms to a completely dehydrated phase even at 100 °C, accompanied by a volume reduction of 16.6%, and is thermally stable at temperatures at least up to 800 °C. The completely dehydrated PST-1 restores to its original state within 1h when exposed to ambient air. |
| 저자 |
신지호1, 김석한1, Stewart J. Warrender2, Paul A. Wright2, Miguel A. Camblor3, 박종문1, 홍석봉1
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| 소속 |
1포항공과대, 2Univ. of St. Andrews, 3Instituto de Ciencia de Materiales de Madrid |
| 키워드 |
hydrothermal synthesis; characterization; gallosilicate gonnardite; KAlGeO4-type gallosilicate kalsilite
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| E-Mail |
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| 원문파일 |
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