Effect of Bubble Formation on the Dissociation of Methane Hydrate in Water: A Molecular Dynamics Study

被引：132

作者：

Yagasaki, Takuma ^{[1
]}

Matsumoto, Masakazu ^{[1
]}

Andoh, Yoshimichi ^{[3
]}

Okazaki, Susumu ^{[3
]}

Tanaka, Hideki ^{[1
,2
]}

机构：

[1] Okayama Univ, Fac Sci, Dept Chem, Okayama 7008530, Japan

[2] Res Ctr New Funct Mat Energy Prod Storage & Trans, Okayama 7008530, Japan

[3] Nagoya Univ, Dept Appl Chem, Nagoya, Aichi 4648603, Japan

来源：

JOURNAL OF PHYSICAL CHEMISTRY B | 2014年 / 118卷 / 07期

关键词：

GAS HYDRATE; CLATHRATE HYDRATE; THERMODYNAMIC STABILITY; HYDROGEN STORAGE; CRYSTAL-GROWTH; NUCLEATION; SIMULATION; DECOMPOSITION; INTERFACE; MECHANISM;

D O I：

10.1021/jp412692d

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

We investigate the dissociation of methane hydrate in liquid water using molecular dynamics simulations. As dissociation of the hydrate proceeds, methane molecules are released into the aqueous phase and eventually they form bubbles. It is shown that this bubble formation, which causes change in the methane concentration in the aqueous phase, significantly affects the dissociation kinetics of methane hydrate. A large system size employed in this study makes it possible to analyze the effects of the change in the methane concentration and the formation of bubbles on the dissociation kinetics in detail. It is found that the dissociation rate decreases with time until the bubble formation and then it turns to increase. It is also demonstrated that methane hydrate can exist as a metastable superheated solid if there exists no bubble.

引用

页码：1900 / 1906

页数：7

共 52 条

[21] Calculation of Liquid Water-Hydrate-Methane Vapor Phase Equilibria from Molecular Simulations [J].