Experimental Study on Subsea Sequestration of CO2 by Hydrate Formation

Since the Industrial Revolution, the extensive combustion of fossil fuels has led to a rapid escalation in atmospheric CO2 concentration, exacerbating global warming [1]. Carbon Capture and Storage (CCS) stands as a critical pathway for mitigating CO2 emissions and reducing atmospheric CO2 levels [2]. In this study, kinetic experiments on the formation of liquid CO2 hydrates in porous media were conducted using a high-pressure autoclave. The amount of hydrate formed and the conversion rate were determined under varying initial pressures, temperatures, and conditions with the surfactant, Sodium Dodecyl Sulfate (SDS). The experimental results indicate that a higher initial pressure leads to a faster hydrate formation rate, a greater hydrate yield, and a higher CO2 conversion rate. As the SDS concentration increased, both the hydrate yield and the gas conversion rate exhibited a trend of first increasing and then decreasing. The maximum amount of CO2 hydrate formed, 10.58 mmol, and a gas conversion rate of 61.08% were achieved at an SDS concentration of 0.4 g·L−1.