CO₂ Adsorption on Variably Hydrated Cation-Exchanged Montmorillonite-Rich Clays.

ABSTRACT: Layered swelling clay minerals like montmorillonite (MMT) can competitively and synergistically adsorb CO₂ and H₂O in their interlayer galleries. This work examines how different interlayer cations, relative humidity levels (and amount of cosorbed H₂O), and (de)hydration history affect CO₂ adsorption on MMT and MMT-rich bentonite at near-ambient pressure and temperature. For CO₂ to be adsorbed, the MMT requires either large (e.g., Cs⁺) or hydrated interlayer cations to provide a sufficiently wide interlayer gallery, and must not have too much H₂O adsorbed competitively with CO₂. Na-MMT and initially anhydrous Mg- and Ca-MMT studied under increasing relative humidity conditions adsorb little CO₂

SUBMITTER: Mendel N 

PROVIDER: S-EPMC11998085 | biostudies-literature | 2025 Apr

REPOSITORIES: biostudies-literature