Cited by 48Carbon Dioxide Capture TechnologiesZeolite Catalysis and SynthesisMetal-Organic Frameworks: Synthesis and Applications

Unusually Low Heat of Adsorption of CO2 on AlPO and SAPO Molecular Sieves

Open access
Pérez-Botella, Eduardo, Martínez-Franco, Raquel, González-Camuñas, Nuria, Cantín, Ángel, Palomino, Miguel, Moliner, Manuel, Valencia, Susana, Rey, Fernando·2020·Frontiers in Chemistry

Abstract

The capture of CO2 from post-combustion streams or from other mixtures, such as natural gas, is an effective way of reducing CO2 emissions, which contribute to the greenhouse effect in the atmosphere. One of the developing technologies for this purpose is physisorption on selective solid adsorbents. The ideal adsorbents are selective towards CO2, have a large working adsorption capacity at atmospheric pressure and are easily regenerated, resulting in high working capacity. Therefore, adsorbents combining molecular sieving properties and low heats of adsorption of CO2 are of clear interest as they will provide high selectivities and regenerabilities in CO2 separation process. Here we report that some aluminophosphate (AlPO) and silicoaluminophosphate (SAPO) materials with LTA, CHA and AFI structures present lower heats of adsorption of CO2 (13 – 25 kJ/mol) than their structurally analogous zeolites at comparable framework charges. In some cases, their heats of adsorption are even lower than those of pure silica composition (20 – 25 kJ/mol). This could mean a great improvement in the regeneration process compared to the most frequently used zeolitic adsorbents for this application while maintaining most of their adsorption capacity, if materials with the right stability and pore size and topology are found.

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Crossref · 10.3389/fchem.2020.588712

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  • In SAPOs, the Si distribution has an important effect on the catalytic and adsorptive behavior of the materials.

    “In the case of SAPOs, the Si distribution can be controlled by modifying the synthesis conditions and also has an important effect on the catalytic and adsorptive behavior of the materials.”

    From Zeolites in Adsorption Processes: State of the Art and Future Prospects (2022) · cites this paper as [152]

    The Methods section (Estimated Framework Negative Charge; page unavailable) says that isolated Si and Si-rich domains contribute differently to SAPO framework charge, which the paper uses to compare CO2 adsorption heats. This supports an effect of Si distribution on the adsorptive behavior studied. The paper does not itself establish an effect on catalytic behavior; that connection appears only in the title of a work listed in its References. (LLM, conf=0.82)

    Experimental — accuracy not yet measured
  • In SAPOs, the Si distribution can be controlled by modifying the synthesis conditions.

    “In the case of SAPOs, the Si distribution can be controlled by modifying the synthesis conditions and also has an important effect on the catalytic and adsorptive behavior of the materials.”

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Research works printed but not linked: 1

  1. The National Academies of Sciences, Engineering and Medicine (2018). Negative Emissions Technologies and Reliable Sequestration: A Research Agenda. Washington, DC: The National Academies Press. 31120708

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Authors
Pérez-Botella, E., Martínez-Franco, R., González-Camuñas, N., Cantín, Á., Palomino, M., Moliner, M., Valencia, S., & Rey, F.
Affiliations
Consejo Superior de Investigaciones Científicas (ES)
Venue
Frontiers in Chemistry
Published
2020-10-28
Volume
8
Pages
588712-588712
ISSN
2296-2646 (ISSN-L)
OpenAlex
W3096363139
Cited by
47
References
39
Citations by year
2026: 2 · 2025: 6 · 2024: 5 · 2023: 11 · 2022: 7 · 2021: 14 · 2020: 2
FWCI
4.18
Type
journal article
Language
en
Open access
Locations
  • Frontiers in Chemistry (publishedVersion, cc-by)
  • PubMed Central (publishedVersion, cc-by)
  • PubMed (publishedVersion)
  • HAL (submittedVersion, cc-by)
  • DOAJ (DOAJ: Directory of Open Access Journals) (submittedVersion, cc-by-sa)
  • RiuNet (Universitat Politècnica de València) (submittedVersion, cc-by-nc-nd)
Funders
  • Ministerio de Ciencia, Innovación y Universidades
  • Horizon 2020
  • Fundación Ramón Areces
Topics
  • Physical Sciences › Engineering › Mechanical Engineering › 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, heat of adsorption, aluminophosphate molecular sieves, silicoaluminophosphate molecular sieves, post-combustion CO2 capture, adsorbent regeneration, AFI structure, zeolite comparison, natural gas upgrading, CO2 separation

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