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The synthesis and structure of SSZ-73: An all-silica zeolite with an unusual framework topology

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Author(s)

David S. Wragg, Russell Morris, Allen W. Burton, Stacey I. Zones, Kenneth Ong, Greg Lee

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Abstract

This paper reports the synthesis, characterization, and crystallographic studies of the new all-silica zeolite SSZ-73. The framework topology of SSZ-73 is isostructural with the aluminophosphate STA-6 (SAS). SSZ-73 is prepared from fluoride-containing gels using 3-ethyl-1,3,8,8-tetramethyl-3-azoniabicyclo[3.2.1]octane cation as a structure-directing agent. SSZ-73 is an all-silica zeolite with a one-dimensional system of eight-ring pores. However, SSZ-73 possesses a remarkably high micropore volume (0.25 cm(3)/g) due to the rather large cages in the structure. A single-crystal X-ray diffraction study of the as-made material shows that fluoride resides within the double six-ring cages of the SAS framework. Molecular docking studies were performed for the two geometric isomers of the structure-directing agent in the all-silica frameworks of SAS, RTH, ITE, and STF. The studies suggest that the isomer with the ethyl group cis to the bridgehead carbon is the likely structure-directing agent for SSZ-73 and that the other isomer may be responsible for the small amounts of RTH impurity observed in some preparations of SSZ-73.

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Original languageEnglish
Pages (from-to)3924-3932
Number of pages9
JournalChemistry of Materials
Volume19
DOIs
Publication statusPublished - 7 Aug 2007

    Research areas

  • STRUCTURE-DIRECTING AGENTS, LARGE-PORE CHANNELS, 5-COORDINATE SILICON, CRYSTAL-STRUCTURE, MOLECULAR-SIEVES, ORGANIC CATIONS, FLUORIDE IONS, FORCE-FIELD, LOCATION, POLYMORPH

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