Acid-Base Properties of H3+nPVnMo12-nO40 Heteropolyacids, Pure and Supported on K3PMo12O40 Full article
Journal |
Applied Catalysis (up to 1991)
ISSN: 0166-9834 |
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Output data | Year: 1991, Volume: 73, Number: 2, Pages: 153-163 Pages count : 11 DOI: 10.1016/0166-9834(91)85133-G | ||||
Tags | acid-base properties, dehydration, heteropolyacids. | ||||
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Abstract:
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.
Cite:
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
Dates:
Submitted: | Oct 6, 1989 |
Accepted: | Mar 7, 1991 |
Published print: | Jun 13, 1991 |
Published online: | Nov 16, 2001 |
Identifiers:
Web of science | WOS:A1991FV42900001 |
Scopus | 2-s2.0-0026171607 |
Elibrary | 31167579 |
Chemical Abstracts | 1991:521046 |
Chemical Abstracts (print) | 115:121046 |
OpenAlex | W2038464558 |