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Intercalation of CO 2 Selected by Type of Interlayer Cation in Dried Synthetic Hectorite

2023; American Chemical Society; Volume: 39; Issue: 14 Linguagem: Inglês

10.1021/acs.langmuir.2c03093

1520-5827

Kristoffer W. Bø Hunvik, Konstanse Kvalem Seljelid, Dirk Wallacher, Alexsandro Kirch, Leide P. Cavalcanti, Patrick Loch, Paul Monceyron Røren, Paulo Henrique Michels-Brito, R. Droppa, Kenneth D. Knudsen, Caetano R. Miranda, Josef Breu, Jon Otto Fossum,

High-pressure geophysics and materials

Clay minerals are abundant in caprock formations for anthropogenic storage sites for CO2, and they are potential capture materials for CO2 postcombustion sequestration. We investigate the response to CO2 exposure of dried fluorohectorite clay intercalated with Li+, Na+, Cs+, Ca2+, and Ba2+. By in situ powder X-ray diffraction, we demonstrate that fluorohectorite with Na+, Cs+, Ca2+, or Ba2+ does not swell in response to CO2 and that Li-fluorohectorite does swell. A linear uptake response is observed for Li-fluorohectorite by gravimetric adsorption, and we relate the adsorption to tightly bound residual water, which exposes adsorption sites within the interlayer. The experimental results are supported by DFT calculations.