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Published October 16, 2017 | Supplemental Material
Journal Article Open

CIT-9: a fault-free, gmelinite zeolite

Abstract

A synthetic, fault-free gmelinite (GME) zeolite is prepared using a specific organic structure-directing agent (OSDA), cis-3,5-dimethylpiperidinium. The cis-isomers align in the main 12-membered ring (MR) channel of GME. Trans-isomer OSDA leads to the small-pore zeolite SSZ-39 with the OSDA in its cages. Data from N_2-physisorption and rotation electron diffraction provide evidence for the openness of the 12 MR channel in the GME 12×8×8 pore architecture and the absence of stacking faults, respectively. CIT-9 is hydrothermally stable when K^+-exchanged, while in the absence of exchange, the material transforms into an aluminous AFI-zeolite. The process of this phase-change was followed by in situ variable temperature powder X-ray diffraction. CIT-9 has the highest Si/Al ratio reported for GME, and along with its good porosity, opens the possibility of using GME in a variety of applications including catalysis.

Additional Information

© 2017 Wiley-VCH Verlag GmbH & Co. KGaA, Weinheim. Manuscript received: July 21, 2017; Revised manuscript received: August 25, 2017; Accepted manuscript online: August 30, 2017; Version of record online: September 21, 2017. M.D. thanks the Research Foundation - Flanders (FWO) and BOFZAP for funding. SACHEM Inc. and PQ Corporation are thanked for providing the piperidinium OSDA and sodium silicate, respectively. Tom Rea and Maryam Deldar are thanked for RED and variable temperature PXRD respectively. Most of the work performed at Caltech was supported by Chevron Energy Technology Company. Dr. Stacey Zones is thanked for insightful discussions. The authors declare no conflict of interest.

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August 21, 2023
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