To support effective geological CO₂ sequestration design and operation, dissolution and reaction in CO₂-brine-clay mineral particle systems (sepiolite and montmorillonite) were studied under subcritical to supercritical CO₂ conditions (10 bar to 150 bar at 45 °C and 65 °C). The order of ion dissolution from the framework of sepiolite in the brine was slightly different under each experimental condition, whereas the order of dissolved ion concentration from the montmorillonite was not varied. The solubility of CO₂ was lower in the CO₂-brine-clay mineral particle system than in a CO₂-brine system. Precipitation of amorphous silica as a secondary mineral formation was observed after the reaction of both sepiolite and montmorillonite. The CO₂ solubility model, considering ion concentration and aqueous silica, reasonably predicted the CO₂ solubility from subcritical to supercritical conditions. The kinetic rate constant of the dissolution reaction of sepiolite was correlated with the initial pH of the brine. After reaction with high-pressure CO₂-saturated brine, the micro-crystallinity of sepiolite did not change, whereas the basal (001) plane of montmorillonite showed deformation in micro-crystallinity after the dissolution reaction. By contrast, reaction with the CO₂–saturated brine led to a decrease in the surface area of sepiolite and an increase in the surface area of montmorillonite.

为了支持有效的地质CO ₂隔离设计和操作，研究了在亚临界到超临界CO ₂条件（在45°C和65°C下为10 bar至150 bar ）下，CO _2-粘土粘土矿物颗粒系统（海泡石和蒙脱石）中的溶解和反应。°C）。在每种实验条件下，从海泡石骨架中溶出的离子的顺序在每种实验条件下都略有不同，而从蒙脱土中溶出的离子浓度的顺序没有变化。CO的溶解度₂是在CO下₂ -brine粘土矿物粒子系统相比，在CO ₂-盐水系统。海泡石和蒙脱石反应后，观察到无定形二氧化硅的沉淀是次要矿物的形成。考虑到离子浓度和含水二氧化硅，CO ₂溶解度模型合理地预测了从亚临界到超临界条件的CO ₂溶解度。海泡石溶解反应的动力学速率常数与盐水的初始pH相关。与高压CO ₂饱和盐水反应后，海泡石的微结晶度没有变化，而蒙脱石的基底（001）平面在溶解反应后显示出微结晶度的变形。相反，与CO _2的反应–饱和盐水导致海泡石表面积减少，而蒙脱土表面积增加。