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Expanding the previously known family of ‐onium (ammonium, phosphonium, and sulfonium) organic structure‐directing agents (OSDAs) for the synthesis of zeolite MFI, a new member, the arsonium cation, is used for the first time. The new group of tetraalkylarsonium cations has allowed the synthesis of the zeolite ZSM‐5 with several different chemical compositions, opening a route for the synthesis of...
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