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Thermodynamics and characteristics of heterogeneous nucleation of CO2 hydrate by fractal surface and solution activity
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  • Mengyang Li,
  • Shuanshi Fan,
  • Yanhong Wang,
  • Xuemei Lang,
  • Gang Li
Mengyang Li
South China University of Technology
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Shuanshi Fan
South China University of Technology
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Yanhong Wang
South China University of Technology

Corresponding Author:[email protected]

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Xuemei Lang
South China University of Technology
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Gang Li
South China University of Technology
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Abstract

The massive emission of the greenhouse gas CO2 has had a significant effect on the global climate and environment, causing widespread concern around the globe. CO2 storage in clathrate hydrate is a possible strategy for reducing atmospheric CO2. Nevertheless, the CO2 hydrate formation rate is slow and the corresponding nucleation mechanism is unknown, limiting the commercial application of this technology. This study developed a thermodynamic model based on the classical nucleation theory, considering the effects of surface geometry and CO2 dissolution on the solution's activity. The critical nucleation radius and energy barrier of CO2 hydrate nucleation were determined through numerical calculation. It was discussed how pressure, temperature, wall curvature, roughness, wettability, and solution activity affect the nucleation of CO2 hydrate. This paper's research findings contribute to advancing carbon capture and storage technology based on the hydrate method.