Synchrotron XRD and NMR evidence of germanium redistribution during silylation of BEC-type germanosilicateстатья
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Аннотация:The localization and distribution of germanium atoms in the framework positions of GeBEC
zeolite upon silylation has been studied using synchrotron XRD and 19F NMR. The high
thermal stability of Ge-BEC material synthesized using 1-benzyl-1,4-diazabicyclo[2.2.2]octane as
the structure-directing agent (SDA) has been observed enabling the preparation of calcined GeBEC.
Unexpectedly inhomogeneous enrichment of double-four membered ring (d4r) subunits in
BEC structure with germanium has been observed. Interaction of germanosilicate with (NH4)2SiF6
led to the selective substitution of germanium atoms in T2 and T3 positions with silicon while
fluoride anions preferably occupy positions inside d4r subunits.