Zeolites ZSM-25 and PST-20: Selective Carbon Dioxide Adsorbents at High Pressures
Abstract
Natural gas upgrading requires the separation of its major components, predominantly CH 4 and CO 2, 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 CO 2 from CH 4 over a wide temperature and pressure range (298–373 K and 0–25 bar). Both zeolites exhibit impressive CO 2 /CH 4 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 H 2 O. 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.
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CO2 adsorption on RHO and related zeolites involves simultaneous cation relocation and structure change.
“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 [275]
Promising values of CO2/CH4 selectivity and heat of adsorption of CO2 have been obtained using medium-, high-, and pure-silica LTA, RHO, MWF, PWN, FAU, CHA, AEI, STT, and RRO zeolites and AlPOs/SAPOs with CHA, RHO, AFX, AFN, and AEI structures.
“Promising values of CO2/CH4 selectivity and heat of adsorption of CO2 have been obtained using medium-, high-, and pure-silica LTA,501 RHO,273 MWF, PWN275,502 (and other RHO-related structures), FAU,483 CHA,503 AEI, STT, and RRO504 zeolites and aluminophosphates (AlPOs) and silicoaluminophosphates (SAPOs) with CHA, RHO, AFX, AFN, and AEI structures.152,505−508”
From Zeolites in Adsorption Processes: State of the Art and Future Prospects (2022) · cites this paper as [275]
In RHO and RHO-related structures, selectivity is enhanced by structural changes in framework and cation relocation upon CO2 adsorption; these changes and trapdoor effects do not take place upon CH4 adsorption, leading to extremely high selectivities.
“In the case of RHO and RHO-related structures, the selectivity is enhanced by structural changes in the framework and in cation relocation upon CO2 adsorption.261,263,273−275,502,512−515 These structural changes and trapdoor effects do not take place upon CH4 adsorption, which leads to extremely high selectivities.”
From Zeolites in Adsorption Processes: State of the Art and Future Prospects (2022) · cites this paper as [275]
Materials such as SAPO-RHO (RHO), NaTEA-PST-20, Li-SSZ-13-6, Na-SSZ-13-6 (CHA), or SAPO-56 (AFX) present promising values of selectivities (>10) and working capacities (ca. 0.5 mmol/g) at relevant conditions, comparable with traditional 5A and 13X zeolites.
“Materials, such as SAPO-RHO (RHO),507 NaTEA-PST-20,275 Li-SSZ-13–6, Na-SSZ-13–6 (CHA),555 or SAPO-56 (AFX)507 present promising values of selectivities (>10) and working capacities (ca. 0.5 mmol/g) at relevant conditions, comparable with those of traditional 5A521 and 13X522 zeolites.”
From Zeolites in Adsorption Processes: State of the Art and Future Prospects (2022) · cites this paper as [275]
Other materials with lower polarity, such as high- and pure-silica zeolites, AlPOs, and SAPOs, minimize water adsorption and energy required for regeneration, while keeping promising selectivities and working capacities in some cases.
“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 [275]
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Zeolites in Adsorption Processes: State of the Art and Future Prospects
Pérez-Botella, E., Valencia, S., & Rey, F. (2022) · Chemical Reviews · doi:10.1021/acs.chemrev.2c00140 · Cited by 1,126 · see citing works
Utilization of zeolites as CO2 capturing agents: Advances and future perspectives
Kumar, S., Srivastava, R., & Koh, J. (2020) · Journal of CO2 Utilization · doi:10.1016/j.jcou.2020.101251 · Cited by 405 · see citing works
Georgieva, V. M., Bruce, E. L., Verbraeken, M. C., Scott, A. R., Casteel, W. J., Brandani, S., & Wright, P. A. (2019) · Journal of the American Chemical Society · doi:10.1021/jacs.9b05539 · Cited by 147 · see citing works
- Authors
- Min, J. G., Kemp, K. C., & 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
- 2017-02-02
- Volume
- 121
- Issue
- 6
- Pages
- 3404-3409
- ISSN
- 1932-7447 (ISSN-L)
- 1932-7455
- OpenAlex
- W2581782122
- Cited by
- 56
- References
- 0
- Citations by year
- 2026: 3 · 2025: 2 · 2024: 7 · 2023: 5 · 2022: 6 · 2021: 12 · 2020: 10 · 2019: 4 · 2018: 5 · 2017: 2
- FWCI
- 2.20
- 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 › Chemistry › Inorganic Chemistry › Zeolite Catalysis and Synthesis
- Physical Sciences › Engineering › Mechanical Engineering › Carbon Dioxide Capture Technologies
- Physical Sciences › Chemistry › Inorganic Chemistry › Metal-Organic Frameworks: Synthesis and Applications
- Keywords
- CO2/CH4 separation, CO2 adsorption, natural gas upgrading, high-pressure gas separation, CO2/CH4 selectivity, framework flexibility, water resistance
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