A Dual-Role Additive as a CO₂ Hydrate Promoter and a Corrosion Inhibitor: Application in CO₂ Capture, Transportation, and Sequestration

Chemical additives are known to play a crucial role in the deployment of gas hydrate-based CO2 capture, transportation, and sequestration (CCTS) technologies. In this study, we investigate the effectiveness of a new additive, 1,2,3-benzotriazole (BTA), in promoting CO2 hydrate formation and inhibiting corrosion. We evaluated the kinetics of CO2 hydrate formation using various concentrations of BTA, ranging from 0.1 to 1.0 wt %, under operating conditions of 3.2 ± 0.2 MPa pressure and approximately 274 ± 0.5 K temperature. Moreover, we examine the impact of the gas-to-liquid ratio on the CO2 hydrate formation kinetics. The results indicate that BTA significantly enhances the hydrate formation kinetics and improves CO2 storage capacity. Additionally, we conducted electrochemical impedance spectroscopy (EIS), potentiodynamic polarization (PDP), and gravimetric analysis to assess the corrosion inhibition efficacy of BTA in 1 M HCl and CO2-saturated saline water (3.5% NaCl) at various concentrations. Our findings demonstrate that BTA serves a dual function as a hydrate promoter and a corrosion inhibitor.