Enhanced formation of methane hydrate from active ice with high gas uptake

Peng Xiao, Juan-Juan Li, Wan Chen, Wei-Xin Pang, Xiao-Wan Peng, Yan Xie, Xiao-Hui Wang, Chun Deng, Chang-Yu Sun (), Bei Liu (), Yu-Jie Zhu, Yun-Lei Peng, Praveen Linga () and Guang-Jin Chen ()
Additional contact information
Peng Xiao: China University of Petroleum
Juan-Juan Li: China University of Petroleum
Wan Chen: China University of Petroleum
Wei-Xin Pang: CNOOC Research Institute Co., Ltd.
Xiao-Wan Peng: China University of Petroleum
Yan Xie: China University of Petroleum
Xiao-Hui Wang: China University of Petroleum
Chun Deng: China University of Petroleum
Chang-Yu Sun: China University of Petroleum
Bei Liu: China University of Petroleum
Yu-Jie Zhu: China University of Petroleum
Yun-Lei Peng: China University of Petroleum
Praveen Linga: National University of Singapore
Guang-Jin Chen: China University of Petroleum

Nature Communications, 2023, vol. 14, issue 1, 1-8

Abstract: Abstract Gas hydrates provide alternative solutions for gas storage & transportation and gas separation. However, slow formation rate of clathrate hydrate has hindered their commercial development. Here we report a form of porous ice containing an unfrozen solution layer of sodium dodecyl sulfate, here named active ice, which can significantly accelerate gas hydrate formation while generating little heat. It can be readily produced via forming gas hydrates with water containing very low dosage (0.06 wt% or 600 ppm) of surfactant like sodium dodecyl sulfate and dissociating it below the ice point, or by simply mixing ice powder or natural snow with the surfactant. We prove that the active ice can rapidly store gas with high storage capacity up to 185 Vg Vw−1 with heat release of ~18 kJ mol−1 CH4 and the active ice can be easily regenerated by depressurization below the ice point. The active ice undergoes cyclic ice−hydrate−ice phase changes during gas uptake/release, thus removing most critical drawbacks of hydrate-based technologies. Our work provides a green and economic approach to gas storage and gas separation and paves the way to industrial application of hydrate-based technologies.

Date: 2023
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DOI: 10.1038/s41467-023-43487-6

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