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High-Throughput Synthesis and Structure of Zeolite ZSM-43 with Two-Directional 8‑Ring Channels
The aluminosilicate zeolite ZSM-43
(where ZSM = Zeolite Socony Mobil) was first synthesized more than
3 decades ago, but its chemical structure remained unsolved because
of its poor crystallinity and small crystal size. Here we present
optimization of the ZSM-43 synthesis using a high-throughput approach
and subsequent structure determination by the combination of electron
crystallographic methods and powder X-ray diffraction. The synthesis
required the use of a combination of both inorganic (Cs<sup>+</sup> and K<sup>+</sup>) and organic (choline) structure-directing agents.
High-throughput synthesis enabled a screening of the synthesis conditions,
which made it possible to optimize the synthesis, despite its complexity,
in order to obtain a material with significantly improved crystallinity.
When both rotation electron diffraction and high-resolution transmission
electron microscopy imaging techniques are applied, the structure
of ZSM-43 could be determined. The structure of ZSM-43 is a new zeolite
framework type and possesses a unique two-dimensional channel system
limited by 8-ring channels. ZSM-43 is stable upon calcination, and
sorption measurements show that the material is suitable for adsorption
of carbon dioxide as well as methane