Park, Taehyung Kyung, Daeseung Lee, Woojin Effect of Organic Matter on CO<sub>2</sub> Hydrate Phase Equilibrium in Phyllosilicate Suspensions In this study, we examined various CO<sub>2</sub> hydrate phase equilibria under diverse, heterogeneous conditions, to provide basic knowledge for successful ocean CO<sub>2</sub> sequestration in offshore marine sediments. We investigated the effect of geochemical factors on CO<sub>2</sub> hydrate phase equilibrium. The three-phase (liquid–hydrate–vapor) equilibrium of CO<sub>2</sub> hydrate in the presence of (i) organic matter (glycine, glucose, and urea), (ii) phyllosilicates [illite, kaolinite, and Na-montmorillonite (Na-MMT)], and (iii) mixtures of them was measured in the ranges of 274.5–277.0 K and 14–22 bar. Organic matter inhibited the phase equilibrium of CO<sub>2</sub> hydrate by association with water molecules. The inhibition effect decreased in the order: urea < glycine < glucose. Illite and kaolinite (unexpandable clays) barely affected the CO<sub>2</sub> hydrate phase equilibrium, while Na-MMT (expandable clay) affected the phase equilibrium because of its interlayer cations. The CO<sub>2</sub> hydrate equilibrium conditions, in the illite and kaolinite suspensions with organic matter, were very similar to those in the aqueous organic matter solutions. However, the equilibrium condition in the Na-MMT suspension with organic matter changed because of reduction of its inhibition effect by intercalated organic matter associated with cations in the Na-MMT interlayer. CO 2 hydrate;CO 2 hydrate equilibrium conditions;inhibition effect;phase equilibrium;CO 2 Hydrate Phase Equilibrium;CO 2 hydrate phase equilibria;CO 2 hydrate phase equilibrium;kaolinite;ocean CO 2 sequestration;matter 2014-06-17
    https://acs.figshare.com/articles/journal_contribution/Effect_of_Organic_Matter_on_CO_sub_2_sub_Hydrate_Phase_Equilibrium_in_Phyllosilicate_Suspensions/2281948
10.1021/es405099z.s001