Zeolites ZSM-25 and PST-20: Selective Carbon Dioxide Adsorbents at High Pressures
SCIE
SCOPUS
- Title
- Zeolites ZSM-25 and PST-20: Selective Carbon Dioxide Adsorbents at High Pressures
- Authors
- Min, Jung Gi; Kemp, K. Christian; Hong, Suk Bong
- Date Issued
- 2017-02
- Publisher
- AMER CHEMICAL SOC
- Abstract
- Natural gas upgrading requires the separation of its major components, predominantly CH4 and CO2, at the high pressures found at the wellhead. Here we demonstrate that the Na+-tetraethylammonium form of ZSM-25 and PST-20, the fourth and fifth generations of the RHO family of zeolites with embedded isoreticular structures, can be efficiently employed to separate CO2 from CH4 over a wide temperature and pressure range (298-373 K and 0-25 bar). Both zeolites exhibit impressive CO2/CH4 selectivity (>20) at 298 K and 25 bar, relatively large adsorption capacity (4.0 and 3.6 mmol g-1, respectively) even at 373 K and 25 bar, and long-term durability even in the presence of H2O. These superior separation properties could be linked to the limited framework flexibilities of ZSM-25 and PST-20 mainly arising from the larger ratio of embedded to scaffold cages in the higher generation of the RHO family.
- URI
- https://oasis.postech.ac.kr/handle/2014.oak/50527
- DOI
- 10.1021/acs.jpcc.6b11582
- ISSN
- 1932-7447
- Article Type
- Article
- Citation
- Journal of Physical Chemistry C, vol. 121, no. 6, page. 3404 - 3409, 2017-02
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