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Synchrotron XRD and NMR evidence of germanium redistribution during silylation of BEC-type germanosilicate

Abstract

The localization and distribution of germanium atoms in the framework positions of Ge-BEC zeolite upon sylilation 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 Ge-BEC. 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.

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Publication details

The article was received on 29 Jun 2017, accepted on 23 Aug 2017 and first published on 07 Sep 2017


Article type: Paper
DOI: 10.1039/C7CE01204G
Citation: CrystEngComm, 2017, Accepted Manuscript
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    Synchrotron XRD and NMR evidence of germanium redistribution during silylation of BEC-type germanosilicate

    P. A. Kots, A. V. Kurkin, V. L. Sushkevich, A. N. Fitch, V. V. Chernyshev and I. I. Ivanova, CrystEngComm, 2017, Accepted Manuscript , DOI: 10.1039/C7CE01204G

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