Structure Elucidation and Computationally Guided Synthesis of SSZ-43: A One-Dimensional 12-Ring Zeolite with Unique Sinusoidal Channels

Maria Roslova, Viktor J. Cybulskis, Mark E. Davis, Stacey I. Zones, Xiaodong Zou, Dan Xie

Research output: Contribution to journalArticlepeer-review

Abstract

The structure of zeolite SSZ-43 was determined by 3D electron diffraction, synchrotron X-ray powder diffraction, and high-resolution transmission electron microscopy. The SSZ-43 framework forms one-dimensional, sinusoidal 12-ring channels from 5461 butterfly units commonly found in other zeolites, but with unique 6.5×6.5 Å apertures and 12-ring 6.5×8.9 Å windows perpendicular to the channels. SSZ-43 crystals are intergrowths of two polytypes: ≈90 % orthorhombic polytype A with ABAB stacking of the 12-rings, and ≈10 % monoclinic polytype B with ABCABC stacking. Molecular modeling performed on the idealized Si-SSZ-43 structure along with empirical relationships for zeolite selectivity in boron- and aluminum-containing synthesis gels were used in a combined approach to design new di-quaternary ammonium organic structure-directing agents (OSDAs). Experimental trials demonstrated that the new OSDAs produced SSZ-43 over a broader range of compositions than previous mono-quaternary OSDAs.

Original languageEnglish (US)
Article numbere202115087
JournalAngewandte Chemie - International Edition
Volume61
Issue number14
DOIs
StatePublished - Mar 28 2022
Externally publishedYes

Keywords

  • Heterogeneous Catalysis
  • Molecular Modeling
  • Structure Determination
  • Targeted Synthesis
  • Zeolites

ASJC Scopus subject areas

  • Catalysis
  • Chemistry(all)

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