Mechanism Analysis of β-Cyclodextrin’s Influence on the Formation of Carbon Dioxide Hydrates in Oil–Water Systems

Carbon capture technologies based on hydrates offer promising avenues for efficient CO 2 sequestration. This study sequentially investigated the effects of stirring rate on the formation kinetics and morphology of CO 2 hydrates in pure water systems, β-cyclodextrin (β-CD) stirring systems, and relative multiphase systems of β-CD with n -decane (C10). The experimental results indicate that, under stirring conditions, β-CD effectively promotes the formation of carbon dioxide hydrates. At a concentration of 2000 ppm, CO 2 consumption reaches 129% of that in pure water, and the induction time is shortened to 22.5%. In the β-CD-C10 mixed system, the addition of 2000 ppm β-CD significantly enhanced gas uptake at all C10 concentrations. At 10 wt % C10, gas uptake increased by 145% compared to the pure C10 system, shifting from inhibition to promotion. The composite system exhibited optimal promotion at a C10 concentration of 5 wt %, outperforming both pure C10 and β-CD systems.