Methane hydrate formation in Black Sea sediments: ionic strength and confinement effect.
Natural gas hydrates (NGH) are crystalline materials in which water molecules form networks where gas molecules are trapped. These NGH have a very large gas storage capacity and have been studied for many years in various fields, both in geosciences and astrophysics and in process engineering. Methane NGH are found in marine sediments on continental margins. Only few studies focus on the kinetics of NGH formation comparing natural sediments present in deep-ocean (Black sea) and geological materials mimicking the natural ones. NGH formation kinetics are required information for understanding the formation history and formation mechanism of NGH - crucial to prevent their destabilization (potential climate change contributor). The present proposal aims at investigating the NGH formation within sediments (artificial and natural clay/silica matrix) at various salt concentrations. This in-situ neutron diffraction experiment will help us to study the influence, in presence of salt, of the spatial organization and the confinement effect of the porous matrix onto the thermodynamic stability and formation kinetics of NGH, under conditions reproducing their Black Sea natural environment.
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GUIMPIER Charlene; AGNISSAN Art Clarie Constant; BENTER Sandra; DAS Srashtasrita; DESMEDT Arnaud; GRÉGOIRE David; Thomas C. Hansen; MICHOT Laurent; NIYONZIMA Jean de Dieu; RUFFINE Livio; TAJOLI Francesca; WANG Shubo; XU Xiaodan and YANG Chueh-Cheng. (2021). Methane hydrate formation in Black Sea sediments: ionic strength and confinement effect.. Institut Laue-Langevin (ILL) doi:10.5291/ILL-DATA.5-22-786
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