Understanding the Pathway of Gas Hydrate Formation with Porous Materials for Enhanced Gas Separation

被引：26

作者：

Liu, Jia ^{[1
,2
]}

Wei, Yajuan ^{[1
,3
]}

Meng, Wei ^{[4
]}

Li, Pei-Zhou ^{[1
]}

Zhao, Yanli ^{[1
]}

Zou, Ruqiang ^{[4
]}

机构：

[1] Nanyang Technol Univ, Sch Phys & Math Sci, Div Chem & Biol Chem, 21 Nanyang Link, Singapore 637371, Singapore

[2] Tianjin Univ, Sch Sci, Dept Chem, Tianjin 300072, Peoples R China

[3] Nankai Univ, Sch Chem, Tianjin 300071, Peoples R China

[4] Peking Univ, Coll Engn, Dept Mat Sci & Engn, Beijing 100871, Peoples R China

来源：

RESEARCH | 2019年 / 2019卷

基金：

中国国家自然科学基金;

关键词：

METHANE HYDRATE; CARBON-DIOXIDE; CLATHRATE HYDRATE; ACTIVATED CARBON; HYDROGEN; MIXTURES; STORAGE; WATER; SII;

D O I：

10.34133/2019/3206024

中图分类号：

O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];

学科分类号：

07 ; 0710 ; 09 ;

摘要：

The reason that the stoichiometry of gas to water in artificial gas hydrates formed on porous materials is much higher than that in nature is still ambiguous. Fortunately, based on our experimental thermodynamic and kinetic study on the gas hydrate formation behavior with classic ordered mesoporous carbon CMK-3 and irregular porous activated carbon combined with density functional theory calculations, we discover a microscopic pathway of the gas hydrate formation on porous materials. Two interesting processes including (I) the replacement of water adsorbed on the carbon surface by gas and (II) further replacement of water in the pore by gas accompanied with the gas condensation in the pore and growth of gas hydrate crystals out of the pore were deduced. As a result, a great enhancement of the selectivity and regeneration for gas separation was achieved by controlling the gas hydrate formation behavior accurately.

引用

页数：10

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