Theoretical study of stability zones of mixed H2 + CO2 gas hydrates CS-I and CS-II

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Abstract

Using the original approach that utilizes statistical thermodynamic theory that has been developed in our group the phase p-T diagram and hydrate phase composition have been calculated for "CO2 + H2 + H2O". Depending on the CO2 content in the gas phase two hydrates types can be formed: CS-I and CS-II. It has been found that increasing CO2 content in the gas phase drastically reduces hydrate formation pressure and in the same time reduces hydrogen uptake by the hydrate. While pure H2 hydrates have CS-II structure, addition of more than 2 mol.% of CO2 into the gas phase makes CS-I hydrate structure more stable, that displays worse maximum hydrogen content. These results could be helpful for practical use of hydrates for efficient CO2 utilization and H2 transportation.

Original languageEnglish
Article number012047
Number of pages5
JournalJournal of Physics: Conference Series
Volume1359
Issue number1
DOIs
Publication statusPublished - 21 Nov 2019
Event4th All-Russian Scientific Conference Thermophysics and Physical Hydrodynamics with the School for Young Scientists, TPH 2019 - Yalta, Crimea, Ukraine
Duration: 15 Sep 201922 Sep 2019

Keywords

  • HYDROGEN CLUSTERS
  • PHASE-DIAGRAM
  • CLATHRATE

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