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Speciation and siting of divalent transition metal ions in silicon-rich zeolites. An FTIR study
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SYSNO ASEP 0511976 Document Type J - Journal Article R&D Document Type Journal Article Subsidiary J Článek ve WOS Title Speciation and siting of divalent transition metal ions in silicon-rich zeolites. An FTIR study Author(s) Lemishka, Mariia (UFCH-W) RID, ORCID
Dědeček, Jiří (UFCH-W) RID, ORCID
Mlekodaj, Kinga (UFCH-W) RID, ORCID
Sobalík, Zdeněk (UFCH-W) RID
Sklenák, Štěpán (UFCH-W) RID, ORCID, SAI
Tabor, Edyta (UFCH-W) RID, ORCIDSource Title Pure and Applied Chemistry. - : Walter de Gruyter - ISSN 0033-4545
Roč. 91, č. 11 (2019), s. 1721-1732Number of pages 12 s. Language eng - English Country US - United States Keywords Brønsted acid ; cobalt ; infrared ; manganese ; nickel ; ssc-2018 ; transition-metal catalysis ; zeolites Subject RIV CF - Physical ; Theoretical Chemistry OECD category Physical chemistry R&D Projects GA17-00742S GA ČR - Czech Science Foundation (CSF) Method of publishing Open access with time embargo (01.04.2020) Institutional support UFCH-W - RVO:61388955 UT WOS 000496795300003 EID SCOPUS 85064632720 DOI 10.1515/pac-2018-1228 Annotation This work is licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License. For more information, please visit: http://creativecommons.org/licenses/by-nc-nd/4.0/ 2019. Speciation and location of Co 2+ , Mn 2+ and Ni 2+ in the extraframework positions of the dehydrated zeolite matrix of ferrierite structure were studied in detail using FTIR spectroscopy of antisymmetric T-O-T vibrations of the zeolite framework. Me 2+ferrierites were prepared by the ion exchange of the NH 4 and Na-zeolite forms and by impregnation of the NH 4 form. Bare Me 2+ occupies all three known cationic sites in dehydrated cationic zeolite. The wavenumbers of bands of individual cations in individual sites were identified. At low Me 2+ loadings (Me 2+ /Al < 0.15), Me 2+ replaces two protonic sites and exclusively bare Me 2+ is present in dehydrated samples. Sets of such samples were employed for the estimation of extinction coefficients of Co 2+ , Mn 2+ and Ni 2+ in cationic sites. These coefficients differ for individual cations but are the same for a cation at different sites. Ion exchange to the NH 4 form allows preparation of samples with maximum possible loading of bare Me 2+ only for Co 2+ . In the case of Mn 2+ , exchange to the Na-parent zeolite or impregnation is required for this purpose while samples with maximum loading by bare Ni 2+ can be prepared only by impregnation. Workplace J. Heyrovsky Institute of Physical Chemistry Contact Michaela Knapová, michaela.knapova@jh-inst.cas.cz, Tel.: 266 053 196 Year of Publishing 2020 Electronic address http://hdl.handle.net/11104/0302209
Number of the records: 1