水模型
分子动力学
热力学
笼状水合物
相(物质)
溶解度
水合物
相平衡
化学
材料科学
物理
物理化学
计算化学
有机化学
作者
Xiluo Hao,Chengfeng Li,Qingguo Meng,Jianye Sun,Li Huang,Qingtao Bu,Congying Li
出处
期刊:ACS omega
[American Chemical Society]
日期:2023-10-10
卷期号:8 (42): 39847-39854
标识
DOI:10.1021/acsomega.3c05673
摘要
The three-phase coexistence line of the CO2 hydrate was determined using molecular dynamics (MD) simulations. By using the classical and modified Lorentz-Berthelot (LB) parameters, the simulations were carried out at 10 different pressures from 3 to 500 MPa. For the OPC water model, simulations with the classic and the modified LB parameters both showed negative deviations from the experimental values. For the TIP4P/Ice water model, good agreement with experimental equilibrium data can be achieved when the LB parameter is adjusted based on the solubility of CO2 in water. Our results also show that the influence of the water model on the equilibrium prediction is much larger than the CO2 model. Current simulations indicated that the H2O-H2O and H2O-CO2 cross-interactions' parameters might contribute equally to the accurate prediction of T3. According to our simulations, the prediction of T3 values showed relatively higher accuracy while using the combination of TIP4P/Ice water and EPM2 CO2 with modified LB parameter. Furthermore, varied χ values are recommended for accurate T3 estimation over a wide pressure range. The knowledge obtained in this study will be helpful for further accurate MD simulation of the process of CO2/CH4 replacement.
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