Bridging the Gap between Zeolites and Dense Silica Polymorphs: Formation of All-Silica Zeolite with High Framework Density from Natural Layered Silicate Magadiite

Masakazu Koike; Isabel Grosskreuz; Yusuke Asakura; Ritsuro Miyawaki; Hermann Gies; Hiroaki Wada; Atsushi Shimojima; Bernd Marler; Kazuyuki Kuroda

doi:10.1002/chem.202301942

Bridging the Gap between Zeolites and Dense Silica Polymorphs: Formation of All-Silica Zeolite with High Framework Density from Natural Layered Silicate Magadiite

Chemistry. 2023 Nov 2;29(61):e202301942. doi: 10.1002/chem.202301942. Epub 2023 Sep 22.

Authors

Masakazu Koike^{1

2}, Isabel Grosskreuz³, Yusuke Asakura^{4

5}, Ritsuro Miyawaki⁶, Hermann Gies³, Hiroaki Wada¹, Atsushi Shimojima^{1

2}, Bernd Marler³, Kazuyuki Kuroda^{1

2}

Affiliations

¹ Department of Applied Chemistry Faculty of Science and Engineering, Waseda University, 3-4-1 Okubo, Shinjuku-ku, Tokyo, 169-8555, Japan.
² Kagami Memorial Research Institute for Materials Science and Technology, Waseda University, 2-8-26 Nishiwaseda, Shinjuku-ku, Tokyo, 169-0051, Japan.
³ Institute of Geology, Mineralogy and Geophysics, Ruhr-University Bochum, Bochum, 44801, Germany.
⁴ Institute of Multidisciplinary Research for Advanced Materials (IMRAM), Tohoku University, 2-1-1 Katahira, Aoba-ku, Sendai, 980-8577, Japan.
⁵ Present Address: Graduate School of Engineering, Nagoya University Furo-cho, Chikusa-ku, Nagoya, 464-8603, Japan.
⁶ Department of Geology and Paleontology, National Museum of Nature and Science, 4-1-1 Amakubo, Tsukuba, 305-0005, Japan.

PMID: 37486717
DOI: 10.1002/chem.202301942

Abstract

A silica zeolite (RWZ-1) with a very high framework density (FD) was synthesized from highly crystalline natural layered silicate magadiite, bridging the gap between the two research areas of zeolites and dense silica polymorphs. Magadiite was topotactically converted into a 3D framework through two-step heat treatment. The resulting structure had a 1D micropore system of channel-like cavities with an FD of 22.1 Si atoms/1000 Å³ . This value is higher than those of all other silica zeolites reported so far, approaching those of silica polymorphs (tridymite (22.6) and α-quartz (26.5)). RWZ-1 is a slight negative thermal expansion material with thermal properties approaching those of dense silica polymorphs. It contributes to the creation of a new field on microporous high-density silica/silicates. Synergistic interactions are expected between the micropores with molecular sieving properties and the dense layer-like building units with different topologies which provide thermal and mechanical stabilities.

Keywords: dense silica polymorphs; high framework density; natural layered silicates; topotactic condensation; zeolites.

Abstract

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