SSZ‐27: A Small‐Pore Zeolite with Large Heart‐Shaped Cavities Determined by Using Multi‐crystal Electron Diffraction

Abstract

The high-silica zeolite SSZ-27 was synthesized using one of the isomers of the organic structure-directing agent that is knowntoproduce the large-pore zeolite SSZ-26 (CON). The structure of the as-synthesized form was solved using multicrystal electron diffraction data. Data were collected on eighteen crystals,a nd to obtain ah igh-quality and complete data set for structure refinement, hierarchical cluster analysis was employed to select the data sets most suitable for merging. The framework structure of SSZ-27 can be described as acombination of two types of cavities,one of which is shaped like ah eart. The cavities are connected through shared 8-ring windows to create straight channels that are linked together in pairs to form ao ne-dimensional channel system. Once the framework structure was known, molecular modelling was used to find the best fitting isomer,and this,inturn, was isolated to improve the synthesis conditions for SSZ-27.Supportinginformation and the ORCID identification number(s) for the author(s) of this article can be found under: https://doi.org/10.