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. 1991. V.73. N2. P.153-163. DOI: 10.1016/0166-9834(91)85133-G WOS Scopus РИНЦ CAPlusCA OpenAlex Sciact

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
Sciact:	12312

Цитирование в БД:

БД	Цитирований
Scopus	44
OpenAlex	42

Альметрики: