Zeolite Rho: a highly selective adsorbent for CO 2 /CH 4 separation induced by a structural phase modification
Open accessAbstract
Zeolite Rho is able to successfully separate CO(2) from CH(4) with the highest selectivity ever observed on the basis of pore diameter and surface polarity. The adsorption of CO(2) provokes structural changes in the zeolite Rho.
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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 [273]
Part of current research on CO2/CH4 separation is directed toward finding materials with lower surface polarity and lower heat of adsorption of CO2 that maintain high CO2/CH4 selectivity and large working capacity thanks to pore size and topology.
“In coherence with this approach, part of the current research on this separation is directed toward finding materials with a lower surface polarity, and thus a lower heat of adsorption of CO2, that maintain a high CO2/CH4 selectivity as well as a large working capacity thanks to their pore size and topology.”
From Zeolites in Adsorption Processes: State of the Art and Future Prospects (2022) · cites this paper as [273]
Zeolitic adsorbents may be selective toward CO2 by exploiting differences in interaction strength (heat of adsorption), by discriminating between sizes (molecular sieving), or by more complex mechanisms such as trapdoor mechanisms and guest-induced structure flexibility.
“There are different ways that zeolitic adsorbents may be selective toward CO2. One is by exploiting differences in the interaction strength, i.e., the heat of adsorption, of the two adsorbates. Another possibility involves discriminating between their sizes, e.g., molecular sieving. More complex mechanisms, such as trapdoor mechanisms and guest-induced structure flexibility, are also interesting,”
From Zeolites in Adsorption Processes: State of the Art and Future Prospects (2022) · cites this paper as [273]
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 [273]
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 [273]
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Gas Separation Using a Membrane
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“[2] Palomino, M.”
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Self-citation
- Authors
- Palomino, M., Corma, A., Jordá, J. L., Rey, F., & Valencia, S.
- Affiliations
- Consejo Superior de Investigaciones Científicas (ES)
- Corresponding author
- Corma, Avelino
- Venue
- Chem. Commun.
- Publisher
- Royal Society of Chemistry (RSC)
- Published
- 2012
- Volume
- 48
- Issue
- 2
- Pages
- 215-217
- ISSN
- 1359-7345 (ISSN-L)
- 1364-548X
- OpenAlex
- W2098253677
- Cited by
- 161
- References
- 0
- Citations by year
- 2026: 7 · 2025: 7 · 2024: 9 · 2023: 14 · 2022: 12 · 2021: 16 · 2020: 12 · 2019: 9 · 2018: 9 · 2017: 8 · 2016: 7 · 2015: 11 · 2014: 20 · 2013: 13 · 2012: 7
- FWCI
- 7.70
- Type
- journal article
- Language
- en
- Open access
- bronze
- doi.org
- Locations
- Chemical Communications (publishedVersion)
- PubMed (publishedVersion)
- RiuNet (Universitat Politècnica de València) (submittedVersion, cc-by-nc-nd)
- Topics
- Physical Sciences › Chemistry › Inorganic Chemistry › Zeolite Catalysis and Synthesis
- Physical Sciences › Engineering › Mechanical Engineering › Carbon Dioxide Capture Technologies
- Physical Sciences › Engineering › Mechanical Engineering › Membrane Separation and Gas Transport
- Keywords
- RHO zeolite, CO2/CH4 separation, gas adsorption selectivity, zeolite framework stability, pore size, surface polarity, CO2 capture
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