Synthesis of microporous zirconosilicates containing ZrO6 octahedra and SiO4 tetrahedra

Formation of Micro/Macroporous Hierarchical Spheres of Titanosilicate Umbite

“…5.5 ϫ 2.7 Å), umbite-type materials do not adsorb N 2 , although they are suitable for adsorbing small molecules, such as water (a slow reversible rehydration of the material has been reported [15] ) and NH 3 , [21] and to retain by ion exchange mono and divalent cations. [18][19][20] Recently, stannosilicate and titanosilicate umbite tubular membranes have shown good performance in the separation of H 2 /N 2 mixtures achieving H 2 /N 2 separation factors higher than 40. [22] Note as well that Ti-umbite silicates have in the past been called STS [19] and AM-2 [15] materials.…”

“…[13] Although its applications have not yet been widely studied, umbite, like the titanosilicates ETS-10 and ETS-4, possess framework structures built of MO 6 (M = Zr, Sn, Ti) octahedra and TO 4 (T = Si, Ge) tetrahedra. [14][15][16][17] These materials are good cation exchangers, and the ion-exchanged forms of Na + and Cs + -Zr-umbite, [18] NH 4 + , Li + , Na + , K + , Rb + and Cs + -Ti-umbite, [19] and Cs + and Sr 2+ -Sn-umbite [20] have been studied. Because of the onedimensional eight-membered ring channel (ca.…”

Deeping into the microporosity of porous silicates Ti- and Sn-umbite

“…Umbite-type materials have interesting properties of ion exchange [3,4,12,[14][15][16][17] from the point of view of recovering radioactive cations such as Rb, Cs and Sr from liquid nuclear wastes. For this last application, these umbite-type materials have advantages over zeolites and metal salts, which decompose in the highly caustic solutions to be treated [18].…”

Novel synthetic alkali‐yttrium silicates with a new microporous mixed framework topology: (Rb,Cs)9Y7Si24O63 and isotypic Rb9Y7Si24O63

“…They were mainly studied because of their large topological diversity and potential applications in the fields of catalysis, gas and ion adsorption, ionexchange and environmental protection [1][2][3]. However, recently also the microporous mixed-framework silicates containing octahedrally coordinated M 3+ -cations became an increasingly studied subject of research [4][5][6][7].…”