Premium
CIT‐9: A Fault‐Free Gmelinite Zeolite
Author(s) -
Dusselier Michiel,
Kang Jong Hun,
Xie Dan,
Davis Mark E.
Publication year - 2017
Publication title -
angewandte chemie
Language(s) - English
Resource type - Journals
eISSN - 1521-3757
pISSN - 0044-8249
DOI - 10.1002/ange.201707452
Subject(s) - zeolite , physisorption , materials science , diffraction , porosity , phase (matter) , crystallography , chemical engineering , catalysis , nanotechnology , chemistry , composite material , organic chemistry , optics , physics , engineering
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.