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Hunvik, Kristoffer W. Bø ; Loch, Patrick ; Wallacher, Dirk ; Kirch, Alexsandro ; Cavalcanti, Leide P. ; Rieß, Martin ; Daab, Matthias ; Josvanger, Vegard ; Grätz, Sven ; Yokaichiya, Fabiano ; Knudsen, Kenneth Dahl ; Miranda, Caetano Rodrigues ; Breu, Josef ; Fossum, Jon Otto:
CO₂ Adsorption Enhanced by Tuning the Layer Charge in a Clay Mineral.
In: Langmuir.
Bd. 37
(2021)
Heft 49
.
- S. 14491-14499.
ISSN 1520-5827
DOI: https://doi.org/10.1021/acs.langmuir.1c02467
Abstract
Due to the compact two-dimensional interlayer pore space and the high density of interlayer molecular adsorption sites, clay minerals are competitive adsorption materials for carbon dioxide capture. We demonstrate that with a decreasing interlayer surface charge in a clay mineral, the adsorption capacity for CO2 increases, while the pressure threshold for adsorption and swelling in response to CO2 decreases. Synthetic nickel-exchanged fluorohectorite was investigated with three different layer charges varying from 0.3 to 0.7 per formula unit of Si4O10F2. We associate the mechanism for the higher CO2 adsorption with more accessible space and adsorption sites for CO2 within the interlayers. The low onset pressure for the lower-charge clay is attributed to weaker cohesion due to the attractive electrostatic forces between the layers. The excess adsorption capacity of the clay is measured to be 8.6, 6.5, and 4.5 wt % for the lowest, intermediate, and highest layer charges, respectively. Upon release of CO2, the highest-layer charge clay retains significantly more CO2. This pressure hysteresis is related to the same cohesion mechanism, where CO2 is first released from the edges of the particles thereby closing exit paths and trapping the molecules in the center of the clay particles.
Weitere Angaben
| Publikationsform: | Artikel in einer Zeitschrift |
|---|---|
| Begutachteter Beitrag: | Ja |
| Keywords: | CARBON DIOXIDE; COLLECTIVE DYNAMICS; X-RAY; WATER; MONTMORILLONITE; HYDRATION; INTERCALATION; SMECTITE; DELAMINATION; ORGANIZATION |
| Institutionen der Universität: | Fakultäten > Fakultät für Biologie, Chemie und Geowissenschaften > Fachgruppe Chemie > Lehrstuhl Anorganische Chemie I > Lehrstuhl Anorganische Chemie I - Univ.-Prof. Dr. Josef Breu Fakultäten Fakultäten > Fakultät für Biologie, Chemie und Geowissenschaften Fakultäten > Fakultät für Biologie, Chemie und Geowissenschaften > Fachgruppe Chemie Fakultäten > Fakultät für Biologie, Chemie und Geowissenschaften > Fachgruppe Chemie > Lehrstuhl Anorganische Chemie I |
| Titel an der UBT entstanden: | Nein |
| Themengebiete aus DDC: | 500 Naturwissenschaften und Mathematik > 540 Chemie |
| Eingestellt am: | 06 Okt 2022 05:57 |
| Letzte Änderung: | 06 Okt 2022 05:57 |
| URI: | https://eref.uni-bayreuth.de/id/eprint/72217 |