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Issue 31, 2017
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Topotactic conversion of layered silicate RUB-15 to silica sodalite through interlayer condensation in N-methylformamide

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Abstract

Silica sodalite was obtained using topotactic conversion of layered silicate RUB-15 through stepwise processes that consisted of the control of stacking sequence of the layers, interlayer condensation by refluxing, and elimination of intercalated guest species. The interlayer condensation of RUB-15, in which acetic acid was pre-intercalated between the layers to control the stacking sequence, afforded a sodalite framework containing organic guest species by refluxing in N-methylformamide (NMF). The pre-intercalated acetic acid molecules were largely replaced with NMF. This formation process of silica sodalite containing large amounts of intercalated organic guest species is in clear contrast to the previously reported process that used direct calcination of an intercalation compound of layered RUB-15 accommodating acetic acid between the layers. Calcination of the condensed product provided sodalite with fewer defects than the directly calcined product, thus indicating the advantage of the stepwise process. The method reported here is useful for the preparation of pure silica sodalite with relatively low defects and plate-like morphology.

Graphical abstract: Topotactic conversion of layered silicate RUB-15 to silica sodalite through interlayer condensation in N-methylformamide

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Publication details

The article was received on 10 Apr 2017, accepted on 22 May 2017 and first published on 22 May 2017


Article type: Paper
DOI: 10.1039/C7DT01287J
Citation: Dalton Trans., 2017,46, 10232-10239
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    Topotactic conversion of layered silicate RUB-15 to silica sodalite through interlayer condensation in N-methylformamide

    M. Koike, Y. Asakura, M. Sugihara, Y. Kuroda, H. Tsuzura, H. Wada, A. Shimojima and K. Kuroda, Dalton Trans., 2017, 46, 10232
    DOI: 10.1039/C7DT01287J

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