Interfacial Tensions, Solubilities, and Transport Properties of the H2/H2O/NaCl System
A Molecular Simulation Study
Willemijn van Rooijen (TU Delft - Geoscience and Engineering)
P. Habibi (TU Delft - Engineering Thermodynamics)
K. xu (Student TU Delft)
P. Dey (TU Delft - Team Poulumi Dey)
TJH Vlugt (TU Delft - Engineering Thermodynamics)
Hadi Hajibeygi (TU Delft - Geoscience and Engineering)
O. A. Moultos (TU Delft - Engineering Thermodynamics)
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Abstract
Data for several key thermodynamic and transport properties needed for technologies using hydrogen (H2), such as underground H2 storage and H2O electrolysis are scarce or completely missing. Force field-based Molecular Dynamics (MD) and Continuous Fractional Component Monte Carlo (CFCMC) simulations are carried out in this work to cover this gap. Extensive new data sets are provided for (a) interfacial tensions of H2 gas in contact with aqueous NaCl solutions for temperatures of (298 to 523) K, pressures of (1 to 600) bar, and molalities of (0 to 6) mol NaCl/kg H2O, (b) self-diffusivities of infinitely diluted H2 in aqueous NaCl solutions for temperatures of (298 to 723) K, pressures of (1 to 1000) bar, and molalities of (0 to 6) mol NaCl/kg H2O, and (c) solubilities of H2 in aqueous NaCl solutions for temperatures of (298 to 363) K, pressures of (1 to 1000) bar, and molalities of (0 to 6) mol NaCl/kg H2O. The force fields used are the TIP4P/2005 for H2O, the Madrid-2019 and the Madrid-Transport for NaCl, and the Vrabec and Marx for H2. Excellent agreement between the simulation results and available experimental data is found with average deviations lower than 10%.
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