On the H-Form of Natrolite Научная публикация
Журнал |
European Journal of Mineralogy
ISSN: 0935-1221 , E-ISSN: 1617-4011 |
||||
---|---|---|---|---|---|
Вых. Данные | Год: 2006, Том: 18, Номер: 3, Страницы: 345-350 Страниц : 6 DOI: 10.1127/0935-1221/2006/0018-0345 | ||||
Ключевые слова | Ammonium natrolite, Amorphisation, De-ammoniation, Dehydroxylation, Gas chromatography, H-natrolite, IR spectroscopy, Natrolite | ||||
Авторы |
|
||||
Организации |
|
Информация о финансировании (2)
1 | Российский фонд фундаментальных исследований | 04-05-64351 |
2 | Российский фонд фундаментальных исследований | 05-05-64657 |
Реферат:
To resolve the problem of existence of the H-form of natrolite, the thermal decomposition of NH4-exchanged natrolite (as a precursor of the H-form) was studied by gas chromatography, IR spectroscopy and X-ray diffraction. Throughout the decomposition, the de-ammoniation is immediately followed by dehydroxylation, which is evidence for the instability of the Hnatrolite formed after the removal of NH3, and leads to a negligibly small concentration of the OH-groups. The natrolite structure can not persist after the removal of NH3. In the final step of decomposition, the adsorption of NH3 onto Lewis centres accumulated in the amorphosed framework hinders the de-ammoniation. This seems to be one of the major factors which influence the observed increase in the activation energy for NH3
desorption from 117 ( +-13) kJ/mol in the initial step to 270 ( +-20) kJ/mol. Smooth vacuum degassing of NH4-natrolite at 550 K leads to partial de-ammoniation, rather than formation of H-natrolite.
Библиографическая ссылка:
Likhacheva A.Y.
, Veniamonov S.A.
, Paukshtis E.A.
, Belitsky I.A.
On the H-Form of Natrolite
European Journal of Mineralogy. 2006. V.18. N3. P.345-350. DOI: 10.1127/0935-1221/2006/0018-0345 WOS Scopus РИНЦ
On the H-Form of Natrolite
European Journal of Mineralogy. 2006. V.18. N3. P.345-350. DOI: 10.1127/0935-1221/2006/0018-0345 WOS Scopus РИНЦ
Даты:
Поступила в редакцию: | 29 нояб. 2004 г. |
Принята к публикации: | 15 дек. 2005 г. |
Опубликована в печати: | 1 мая 2006 г. |
Идентификаторы БД:
Web of science | WOS:000238970800008 |
Scopus | 2-s2.0-33746119055 |
РИНЦ | 13506356 |
Chemical Abstracts | 2006:704256 |
Chemical Abstracts (print) | 146:232881 |
OpenAlex | W2047938635 |