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- W2792695935 abstract "Solid–state ion exchange of CoCl2·6H2O into NH4+–Beta zeolite (Co/Al = 1, Si/Al = 12.5) was studied throughout the temperature range of 30–500 °C, and isothermally at 500 °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 °C. Following the non–isothermal exchange of Co2+ into Beta zeolite between 400 and 500 °C, the partially hydrated Co(II) complex occupied, temporarily, α, β, and γ–sites, while ε–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 °C, Co2+ ions occupied, definitively, α, β, and γ–sites through a slow migration, extended up to 12 h. Using Infrared spectroscopy upon desorption of C≡O at −196 °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 νC≡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: γ–type < β–type < α–type." @default.
- W2792695935 created "2018-03-29" @default.
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- W2792695935 date "2018-07-01" @default.
- W2792695935 modified "2023-10-06" @default.
- W2792695935 title "Solid–state ion exchange of CoCl 2 ·6H 2 O into NH 4 + –Beta zeolite: Pathway analysis" @default.
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- W2792695935 doi "https://doi.org/10.1016/j.micromeso.2018.01.022" @default.
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