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An Hetero‐Epitaxially Grown Zeolite Membrane
Author(s) -
Jeong Yanghwan,
Hong Sungwon,
Jang Eunhee,
Kim Eunjoo,
Baik Hionsuck,
Choi Nakwon,
Yip Alex C. K.,
Choi Jungkyu
Publication year - 2019
Publication title -
angewandte chemie
Language(s) - English
Resource type - Journals
eISSN - 1521-3757
pISSN - 0044-8249
DOI - 10.1002/ange.201911164
Subject(s) - zeolite , membrane , epitaxy , selectivity , chemical engineering , layer (electronics) , materials science , chemistry , catalysis , organic chemistry , nanotechnology , biochemistry , engineering
The secondary growth methodology to form zeolite membranes has stringent requirements for homogeneous epitaxial intergrowth of the seed layer and limits the number of accessible high‐quality zeolite membranes. Despite previous reports on hetero‐epitaxial growth, high‐performance zeolite membranes have yet to be reported using this approach. Here, the successful hetero‐epitaxial growth of highly siliceous ZSM‐58 (DDR‐type zeolite) films from a SSZ‐13 (CHA‐type zeolite) seed layer is reported. The resulting membranes show excellent CO 2 perm‐selectivities, having maximum CO 2 /N 2 and CO 2 /CH 4 separation factors (SFs) as high as about 17 and 279, respectively, at 30 °C. Furthermore, the hybrid membrane maintains the CO 2 perm‐selectivity in the presence of water vapor (the third main component in both cases), that is, CO 2 /N 2 SF of about 14 and CO 2 /CH 4 SF of about 78, respectively, at 50 °C (a representative temperature of both CO 2 ‐containing streams).