Thermodynamic and kinetic Study of Zinc oxide nanoparticle on the CO2 Gas Hydrate Formation

In this study, the effect of Zinc oxide (ZnO) spherical nanoparticles on the kinetic and thermodynamic equilibrium of carbon dioxide gas hydrate is investigated. ZnO with spherical morphology is synthesized and then characterized. The isochoric method is used to measure the thermodynamic equilibrium of gas hydrate formation in presence of pure water and water-based ZnO nanofluid. Also the rate and amount of gas consumption are measured. Presence of ZnO nanoparticles enhances the heat and mass transfer in hydrate formation process so that the rate ofhydrate formation increase and also the gas storage capacity of gas hydrate enhances. However, the results show that the equilibrium curve of hydrate formation and dissociation is shifted to higher pressures and lower temperatures so that the ZnO nanoparticle acts as thermodynamicinhibitor of hydrate formation. This behaviour might be attributed to the size effect of nanoparticles and also enhancement in CO2 solubility in nanofluid that leads to the reduction in activity of liquid phase.

کلیدواژه ها:

Gas hydrate ، Carbon dioxide ، ZnO nanoparticles ، thermodynamic equilibrium