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CO 2 Adsorption in the RHO Family of Embedded Isoreticular Zeolites
Abstract
More effective carbon capture techniques and materials are still required to combat ever-increasing anthropogenic CO 2 emissions. Here we report the CO 2 adsorption isotherms, at 298–373 K and 0–1.0 bar, on various alkali cation forms of the five members of the RHO family of embedded isoreticular zeolites (i.e., Rho, PST-29, ECR-18, ZSM-25, and PST-20). The adsorption behavior of CO 2 on this new family was found to differ significantly according not only to the zeolite framework flexibility but also to the type of extraframework cation. Among the zeolites studied here, the adsorption isotherms on the Cs + –tetraethylammonium cation form of ZSM-25 and PST-20 are characterized as one-step, with working capacities of 1.3–1.4 mmol g –1 at 298–343 K, which may have a clear advantage for the industrial temperature swing adsorption process. These two zeolite adsorbents also have large CO 2 selectivities ( ca . 100 and 50, respectively) over N 2 and CH 4, as well as good long-term stability.
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“Another interesting case, in which cation relocation and structure change take place simultaneously, is that of CO2 adsorption on RHO and related zeolites.”
From Zeolites in Adsorption Processes: State of the Art and Future Prospects (2022) · cites this paper as [276]
In the citing paper
“Other materials with lower polarity, such as high- and pure-silica zeolites, AlPOs, and SAPOs, minimize water adsorption and the energy required for regeneration, while keeping promising selectivities and working capacities in some cases.275,276,333,502,507,547,554−559”
From Zeolites in Adsorption Processes: State of the Art and Future Prospects (2022) · cites this paper as [276]
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Metadata
- Authors
- Min, J. G., Kemp, K. C., Lee, H., & Hong, S. B.
- Affiliations
- Pohang University of Science and Technology (KR)
- Corresponding author
- Hong, Suk Bong
- Venue
- The Journal of Physical Chemistry C
- Publisher
- American Chemical Society (ACS)
- Published
- 2018-11-26
- Volume
- 122
- Issue
- 50
- Pages
- 28815-28824
- ISSN
- 1932-7447 (ISSN-L)
- 1932-7455
- OpenAlex
- W2902942506
- Cited by
- 53
- References
- 40
- Citations by year
- 2026: 6 · 2025: 5 · 2024: 6 · 2023: 12 · 2022: 6 · 2021: 6 · 2020: 10 · 2019: 2
- FWCI
- 2.88
- Type
- journal article
- Language
- en
- Open access
- closed
- Locations
- The Journal of Physical Chemistry C (publishedVersion)
- Open Access System for Information Sharing (Pohang University of Science and Technology) (submittedVersion)
- Funders
- National Research Foundation of Korea (2012R1A3A-2048833)
- Topics
- Physical Sciences › Chemical Engineering › Filtration and Separation › Carbon Dioxide Capture Technologies
- Physical Sciences › Chemistry › Inorganic Chemistry › Zeolite Catalysis and Synthesis
- Physical Sciences › Chemistry › Inorganic Chemistry › Metal-Organic Frameworks: Synthesis and Applications
- Keywords
- CO2 adsorption, cesium, tetraethylammonium, framework flexibility, temperature swing adsorption, CO2/N2 selectivity, CO2/CH4 selectivity, long-term stability, CO2 capture
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