Solid-state ion exchange of CoCl2 center dot 6H(2)O into NH4+-Beta zeolite: Pathway analysis

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216275%3A25310%2F18%3A39912576" target="_blank" >RIV/00216275:25310/18:39912576 - isvavai.cz</a>

Výsledek na webu

<a href="http://dx.doi.org/10.1016/j.micromeso.2018.01.022" target="_blank" >http://dx.doi.org/10.1016/j.micromeso.2018.01.022</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1016/j.micromeso.2018.01.022" target="_blank" >10.1016/j.micromeso.2018.01.022</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Solid-state ion exchange of CoCl2 center dot 6H(2)O into NH4+-Beta zeolite: Pathway analysis

Popis výsledku v původním jazyce

Solid-state ion exchange of CoCl center dot 6H(2)O into NH4+-Beta zeolite (Co/Al = 1, Si/Al = 12.5) was studied throughout the temperature range of 30-500 degrees C, and isothermally at 500 degrees C for 12 h. In the presence of zeolite, the thermal analysis coupled to mass spectrometry revealed that the hydration/dehydration of the salt is a reversible process. Therefore, the coordination of Co2+ central ion was elucidated by the evaluation of Racah and octahedral ligand-field-splitting parameters, determined from visible diffuse reflectance (DR) spectra recorded between 250 and 350 degrees C. Following the non-isothermal exchange of Co2+ into Beta zeolite between 400 and 500 degrees C, the partially hydrated Co(II) complex occupied, temporarily, alpha, beta, and gamma-sites, while epsilon-site is less-accessible to Co2+ ions on the basis of the quantitative study performed by visible DR spectroscopy. Nevertheless, following the isothermal exchange at 500 degrees C, Co2+ ions occupied, definitively, alpha, beta, and gamma-sites through a slow migration, extended up to 12 h. Using Infrared spectroscopy upon desorption of C O at -196 degrees C, we were able to reveal the presence of [Co(III)O](+) species. Nonetheless, by coupling both Infrared and DR results, we were able to identify, on one hand, the specific bands (in v(C O) region) relative to each Co2+ ion type and to reveal, on the other hand, that the rate of Co2+ ions mobility during isothermal exchange increases in the following order: gamma-type &lt; beta-type &lt; alpha-type.

Název v anglickém jazyce

Solid-state ion exchange of CoCl2 center dot 6H(2)O into NH4+-Beta zeolite: Pathway analysis

Popis výsledku anglicky

Solid-state ion exchange of CoCl center dot 6H(2)O into NH4+-Beta zeolite (Co/Al = 1, Si/Al = 12.5) was studied throughout the temperature range of 30-500 degrees C, and isothermally at 500 degrees C for 12 h. In the presence of zeolite, the thermal analysis coupled to mass spectrometry revealed that the hydration/dehydration of the salt is a reversible process. Therefore, the coordination of Co2+ central ion was elucidated by the evaluation of Racah and octahedral ligand-field-splitting parameters, determined from visible diffuse reflectance (DR) spectra recorded between 250 and 350 degrees C. Following the non-isothermal exchange of Co2+ into Beta zeolite between 400 and 500 degrees C, the partially hydrated Co(II) complex occupied, temporarily, alpha, beta, and gamma-sites, while epsilon-site is less-accessible to Co2+ ions on the basis of the quantitative study performed by visible DR spectroscopy. Nevertheless, following the isothermal exchange at 500 degrees C, Co2+ ions occupied, definitively, alpha, beta, and gamma-sites through a slow migration, extended up to 12 h. Using Infrared spectroscopy upon desorption of C O at -196 degrees C, we were able to reveal the presence of [Co(III)O](+) species. Nonetheless, by coupling both Infrared and DR results, we were able to identify, on one hand, the specific bands (in v(C O) region) relative to each Co2+ ion type and to reveal, on the other hand, that the rate of Co2+ ions mobility during isothermal exchange increases in the following order: gamma-type &lt; beta-type &lt; alpha-type.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

20501 - Materials engineering

Projekt

<a href="/cs/project/GBP106%2F12%2FG015" target="_blank" >GBP106/12/G015: Vývoj nových nanoporézních adsorbentů a katalyzátorů</a><br>

Návaznosti

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Rok uplatnění

2018

Kód důvěrnosti údajů

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

Název periodika

Microporous and Mesoporous Materials

ISSN

1387-1811

e-ISSN

—

Svazek periodika

264

Číslo periodika v rámci svazku

July

Stát vydavatele periodika

NL - Nizozemsko

Počet stran výsledku

12

Strana od-do

218-229

Kód UT WoS článku

000430900000029

EID výsledku v databázi Scopus

2-s2.0-85041457735