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• W4294631404 endingPage "158454" @default.
• W4294631404 startingPage "158454" @default.
• W4294631404 abstract "In nature, CH4 hydrates are mainly buried in marine sediments. The complex marine environments on the seafloor continuously affect hydrate formation. Herein, systematic molecular simulations have been performed to investigate CH4 hydrate formation in clay nanopore, mainly affected by several marine environmental factors, including seawater salinity, pressure and temperature. Simulation results show that these factors exert different effects on hydrate formation in the nanopore and the outside bulk solutions by affecting the mass transfer and phase separation inside and outside of the nanopore. Specifically, high salinity hinders the diffusion of CH4 molecules from nanopores into the outside bulk solutions, promoting hydrate formation in nanopore and inhibiting hydrate formation in bulk solution; salinity has a dual effect on hydrate formation in the whole system by changing the local CH4 concentration via the formation of the hydration of salt ions. High pressure favors the diffusion of CH4 molecules from nanopore into outside bulk solutions, promoting hydrate formation in bulk solution and inhibiting hydrate formation in nanopore; high pressure promotes hydrate formation at the nanopore throats by increasing CH4 concentration and reducing ion concentration therein. In contrast, temperature significantly affects hydrate formation in the system by causing phase separation, i.e. high temperature promotes the aggregation of CH4 molecules to form nanobubbles and inhibits hydrate formation. Under high temperature conditions, the nanobubble in the nanopore gradually decomposes, while the nanobubble in the outside bulk solution grows an extra-large cylindrical nanobubble. These molecular insights into the formation behavior of CH4 hydrates in clay nanopores are helpful for understanding the formation process of natural gas hydrates in marine sediments and the development and utilization of CH4 hydrates." @default.
• W4294631404 created "2022-09-05" @default.
• W4294631404 creator A5014592960 @default.
• W4294631404 creator A5016188051 @default.
• W4294631404 creator A5080265771 @default.
• W4294631404 creator A5081699743 @default.
• W4294631404 date "2022-12-01" @default.
• W4294631404 modified "2023-10-04" @default.
• W4294631404 title "Effects of marine environments on methane hydrate formation in clay nanopores: A molecular dynamics study" @default.
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• W4294631404 doi "https://doi.org/10.1016/j.scitotenv.2022.158454" @default.
• W4294631404 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/36063931" @default.
• W4294631404 hasPublicationYear "2022" @default.
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