Speciation and siting of divalent transition metal ions in silicon-rich zeolites. An FTIR study

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F61388955%3A_____%2F19%3A00511976" target="_blank" >RIV/61388955:_____/19:00511976 - isvavai.cz</a>

Nalezeny alternativní kódy

RIV/00216275:25310/19:39915345

Výsledek na webu

<a href="http://hdl.handle.net/11104/0302209" target="_blank" >http://hdl.handle.net/11104/0302209</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1515/pac-2018-1228" target="_blank" >10.1515/pac-2018-1228</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Speciation and siting of divalent transition metal ions in silicon-rich zeolites. An FTIR study

Popis výsledku v původním jazyce

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.

Název v anglickém jazyce

Speciation and siting of divalent transition metal ions in silicon-rich zeolites. An FTIR study

Popis výsledku anglicky

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.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

10403 - Physical chemistry

Projekt

<a href="/cs/project/GA17-00742S" target="_blank" >GA17-00742S: Binukleární struktury iontů v zeolitech</a><br>

Návaznosti

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Rok uplatnění

2019

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název periodika

Pure and Applied Chemistry

ISSN

0033-4545

e-ISSN

—

Svazek periodika

91

Číslo periodika v rámci svazku

11

Stát vydavatele periodika

US - Spojené státy americké

Počet stran výsledku

12

Strana od-do

1721-1732

Kód UT WoS článku

000496795300003

EID výsledku v databázi Scopus

2-s2.0-85064632720