A1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä
Evaluating the viability of ethylenediamine-functionalized Mg-MOF-74 in direct air capture : The challenges of stability and slow adsorption rate (2024)

Mahajan, S., Elfving, J., & Lahtinen, M. (2024). Evaluating the viability of ethylenediamine-functionalized Mg-MOF-74 in direct air capture : The challenges of stability and slow adsorption rate. Journal of Environmental Chemical Engineering, 12(2), Article 112193. https://doi.org/10.1016/j.jece.2024.112193

JYU-tekijät tai -toimittajat

Mahajan, Shreya
Lahtinen, Manu

Julkaisun tiedot

Julkaisun kaikki tekijät tai toimittajat: Mahajan, Shreya; Elfving, Jere; Lahtinen, Manu

Lehti tai sarja: Journal of Environmental Chemical Engineering

ISSN: 2213-3437

eISSN: 2213-3437

Julkaisuvuosi: 2024

Volyymi: 12

Lehden numero: 2

Artikkelinumero: 112193

Kustantaja: Elsevier

Julkaisumaa: Alankomaat

Julkaisun kieli: englanti

DOI: https://doi.org/10.1016/j.jece.2024.112193

Julkaisun avoin saatavuus: Avoimesti saatavilla

Julkaisukanavan avoin saatavuus: Osittain avoin julkaisukanava

Julkaisu on rinnakkaistallennettu (JYX): https://jyx.jyu.fi/handle/123456789/93611

Tiivistelmä

Carbon removal technologies, such as direct air capture (DAC), hold great potential in mitigating anthropogenic CO2 emissions. Amine-tethered metal-organic frameworks (MOFs) that capture CO2 selectively via chemisorption have been highlighted as frontrunners for CO2 removal technologies. To this end, ethylenediamine (ED) was employed to decorate the metal sites of Mg-MOF-74, and both bare and amine-modified frameworks were thoroughly characterized and studied for DAC using an automated fixed-bed sorption device. The material exhibited a promising CO2 capacity of up to 1.8 mmol/g from 400 ppmv CO2 in humid conditions, although the amount of adsorbed H2O was several times higher. The highest adsorption capacities were measured at 25–35 °C, while decreased capacity was observed at 12 °C due to slower adsorption rate. In dry cyclic adsorption-desorption tests, the cyclic CO2 capacity reduced slightly in 18 cycles. However, at 2 vol% humidity, the capacity dropped rapidly over successive cycles, revealing poor hydrolytic stability. Preliminary coating experiments were conducted on stainless steel plates and cordierite monoliths, suggesting that reasonably even coating layers could be achieved on these substrates with relatively simple coating techniques. High water adsorption, slow adsorption rate at low temperatures, and the rapid cyclic capacity decrease in humid conditions may limit the application of the studied adsorbent for DAC. The vital aspects of the real application of MOFs in DAC, such as adsorption kinetics and stability in humid conditions, are rarely explored in detail in the literature, and these results indicate that these aspects warrant extensive study for the development of practically applicable DAC adsorbents.

YSO-asiasanat: adsorptio; hiilidioksidi; päästöt

Vapaat asiasanat: direct air capture; CO2 adsorption; metal-organic framework

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