Location of Li-ions in synthetic zeolites X and Y

Li+-exchanged Zeolites X and Y (FAU) from Undried Formamide Solution

“…Their characteristic properties depend on partly the nature of the exchangeable cations (Moreno-Gutierrez and Olguin, 2003;Herden et al, 1982). The cation exchange behavior of zeolite depends on (1) the natural of the exchangeable cations, (2) the temperature, (3) the solvent, and (4) the structural properties dictated by the zeolite framework (Moreno-Gutierrez and Olguin, 2003).…”

133Cesium HYSCORE Investigation of the Di-tert-butyl Nitroxide−Cs+ Adsorption Complex in CsNaY Zeolite

“…It is known from neutron diffraction and XRD investigations that in the LiY zeolite only the SII site, that is situated within the supercage next to the six-ring windows of the sodalite units, but not the SIII site in front of the four-ring windows within the supercages is occupied by Li ions. 18,19 Contrary to that, studies of the cesium-exchanged Y zeolite have demonstrated that the cesium ions are located at both SII and SIII sites. [20][21][22][23] Therefore, the DTBN molecules can find two possible adsorption sites and thus form two different adsorption complexes with Cs + cations in NaCsY zeolites.…”

“…As mentioned above, DTBN probe molecules can only form adsorption complexes with cations that are located on sites in the so-called supercages (SII and SIII) of the Y zeolite. It is known from neutron diffraction and XRD investigations that in the LiY zeolite only the SII site, that is situated within the supercage next to the six-ring windows of the sodalite units, but not the SIII site in front of the four-ring windows within the supercages is occupied by Li ions. , Contrary to that, studies of the cesium-exchanged Y zeolite have demonstrated that the cesium ions are located at both SII and SIII sites. − Therefore, the DTBN molecules can find two possible adsorption sites and thus form two different adsorption complexes with Cs + cations in NaCsY zeolites. Since it is well known that mainly supercage Na + ions are exchanged by cesium ions, 20,21,24 the remaining Na + ions are expected to occupy nonsupercage positions.…”

Mixed‐cation LiCa‐LSX zeolite with minimum lithium for air separation

“…Table shows the occupancy of cations in dehydrated X‐type zeolites with pure cations. Several other studies have been employed to determine Li + in the extra framework of types X, Y, and A zeolites using solid state NMR and neutron diffraction methods. The Li cations were found to be evenly distributed with 32 cations each in SI’ (energetically preferred over SI for monovalent cations), SII, and SIII for the Li‐LSX (Si/Al = 1) zeolite as opposed to 22 cations in SIII for the X‐zeolite.…”