Review of thermodynamic and kinetic properties of CO2 hydrate phase transition process

Abstract

Carbon Capture, Utilization, and Storage technology has emerged as a crucial mitigation measure to response the climate change. Sequestering CO₂ as hydrates in geological formations is a long-term, environmentally friendly solution, whose effectiveness hinges on a thorough understanding of its thermodynamic and kinetic properties. Thermodynamic characteristics include phase equilibrium conditions, stability regions, and energy changes, while kinetic properties involve formation rates, decomposition mechanisms, and migration behavior. This paper systematically reviews the characteristics and influencing factors of the thermodynamic and kinetic properties of CO₂ hydrate formation, alongside the methodologies employed to study each of these properties. Furthermore, it proposes strategies for optimizing CO₂ sequestration efficiency based on thermodynamic and kinetic principles, including the regulation of temperature, pressure, salinity, and the use of promoters. These optimization approaches are expected to enhance the feasibility of commercial and large-scale applications of CCUS technology, thereby providing an effective solution for reducing atmospheric greenhouse gas concentrations.