Acid-Base Properties of H3+nPVnMo12-nO40 Heteropolyacids, Pure and Supported on K3PMo12O40 Научная публикация
Журнал |
Applied Catalysis (up to 1991)
ISSN: 0166-9834 |
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Вых. Данные | Год: 1991, Том: 73, Номер: 2, Страницы: 153-163 Страниц : 11 DOI: 10.1016/0166-9834(91)85133-G | ||||
Ключевые слова | acid-base properties, dehydration, heteropolyacids. | ||||
Авторы |
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Организации |
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Реферат:
The acidity of unsupported H3+nPVnMo12-nO40·xH2O heteropolyacids is primarily affected by the degree of hydration, and to a lesser extent by the sample composition. Thermal pretreatment reduces the number of hydrated, strongly acidic protons leaving behind protons which are devoid of the hydration shell, representing weak acid sites, only partially detectable by pyridine, their amount increasing with n. After treatment at 573 K a shift towards weaker acid sites is observed for increasing vanadium substitution due to the growing susceptibility to dehydration. Supporting on K3PMo12O40 enhances the acidic properties by a factor of 3–4. Acid sites present in surface acid layers show a similar strength irrespective of acid composition. The results are consistent with the previously postulated formation of an epitaxial acid coat of increased resistivity against dehydration, isostructural with the support, where the most hydrated, hence most acidic, protons exist as diaquahydrogen ions.
Библиографическая ссылка:
Serwicka E.M.
, Bruckman K.
, Haber J.
, Paukshtis E.A.
, Yurchenko E.N.
Acid-Base Properties of H3+nPVnMo12-nO40 Heteropolyacids, Pure and Supported on K3PMo12O40
Applied Catalysis (up to 1991). 1991. V.73. N2. P.153-163. DOI: 10.1016/0166-9834(91)85133-G WOS Scopus РИНЦ
Acid-Base Properties of H3+nPVnMo12-nO40 Heteropolyacids, Pure and Supported on K3PMo12O40
Applied Catalysis (up to 1991). 1991. V.73. N2. P.153-163. DOI: 10.1016/0166-9834(91)85133-G WOS Scopus РИНЦ
Даты:
Поступила в редакцию: | 6 окт. 1989 г. |
Принята к публикации: | 7 мар. 1991 г. |
Опубликована в печати: | 13 июн. 1991 г. |
Опубликована online: | 16 нояб. 2001 г. |
Идентификаторы БД:
Web of science | WOS:A1991FV42900001 |
Scopus | 2-s2.0-0026171607 |
РИНЦ | 31167579 |
Chemical Abstracts | 1991:521046 |
Chemical Abstracts (print) | 115:121046 |
OpenAlex | W2038464558 |