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dc.creatorBajuk-Bogdanović, Danica
dc.creatorUskoković-Marković, Snežana
dc.creatorHolclajtner-Antunović, Ivanka
dc.date.accessioned2019-09-02T11:46:25Z
dc.date.available2019-09-02T11:46:25Z
dc.date.issued2015
dc.identifier.issn1735-207X
dc.identifier.urihttp://farfar.pharmacy.bg.ac.rs/handle/123456789/2378
dc.description.abstractHeteropoly acids (HPA) attract the attention of large variety of scientists, due to HPA's extraordinary interesting properties and possible application fields. 12-tungstosilicic acid (WSiA), the Keggin type HPA, has some promising characteristic to be used in catalytic processes, but with not well-defined stability. Raman spectroscopy was used for in situ analysis of WSiA hydrolysis in detail in a wide pH range of 1-12. Raman spectroscopy is able to give an almost immediate response/spectrum as a representation of the exact profile/composition of the solution. This method and FTIR spectroscopy, as a complementary technique, enabled recording of the solid and liquid phases of the same sample under different conditions. Our results confirm that the decomposition pathways of WSiA in solution proceed via the formation of the lacunary monovacant anion at pH > 6.4. This anion is a major constituent in pH range up to 9.5. With further increases in pH this species convert to the trivacant lacunary anion. The total decomposition of the Keggin anion to silicate and tungstate occurs at pH > 11.0. The results of the performed study contribute to understand the behavior of WSiA in the water-methanol solution, as the model system of aqueous-organic system. It is concluded that addition of methanol in aqueous solution of WSiA leads to expansion of the pH region where Keggin anion is stable up to 8.1 and above this pH value, precipitation occurs. The obtained data clarify the stability range of WSiA in both water and water-methanol solutions, as well.en
dc.publisherSpringer, New York
dc.relationinfo:eu-repo/grantAgreement/MESTD/Basic Research (BR or ON)/172043/RS//
dc.rightsrestrictedAccess
dc.sourceJournal of the Iranian Chemical Society
dc.subject12-Tungstosilicic aciden
dc.subjectRaman spectroscopyen
dc.subjectFTIRen
dc.subjectSolvolytic stabilityen
dc.subjectIn situ reaction analysisen
dc.titleVibration Spectroscopy Stability Investigation of 12-Tungstosilicic Acid Solutionen
dc.typearticle
dc.rights.licenseARR
dcterms.abstractХолцлајтнер-Aнтуновић, Иванка; Ускоковић-Марковић, Снежана; Бајук-Богдановић, Даница;
dc.citation.volume12
dc.citation.issue1
dc.citation.spage137
dc.citation.epage145
dc.citation.other12(1): 137-145
dc.citation.rankM23
dc.identifier.wos000347416400016
dc.identifier.doi10.1007/s13738-014-0466-y
dc.identifier.scopus2-s2.0-84920874366
dc.identifier.rcubconv_3238
dc.type.versionpublishedVersion


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