A pillared-layer metal-organic framework for efficient separation of C3H8/C2H6/CH4 in natural gas

doi:10.1016/j.cjche.2021.08.011

Abstract

Abstract: Metal-organic frameworks (MOFs) have great potentials as adsorbents for natural gas purification. However, the trade-off between selectivity and adsorption capacity remains a challenge. Herein, we report a pillared-layer metal-organic framework Ni(HBTC)(bipy) for efficiently separating the C₃H₈/C₂H₆/CH₄ mixture. The experimental results show that the adsorption capacity of C₃H₈ and C₂H₆ on Ni(HBTC)(bipy) are as high as 6.18 and 5.85 mmol·g^-1, while only 0.93 mmol·g^-1 for CH₄ at 298 K and 100 kPa. Especially, the adsorption capacity of C₃H₈ at 5 kPa can reach an unprecedented 4.52 mmol·g^-1 and for C₂H₆ it is 1.48 mmol·g^-1 at 10 kPa. The ideal adsorbed solution theory predicted C₃H₈/CH₄ selectivity is as high as 1857.0, superior to most of the reported materials. Breakthrough experiment results indicated that material could completely separate the C₃H₈/C₂H₆/CH₄ mixture. Therefore, Ni(HBTC)(bipy) is a promising material for separation of natural gas.

Key words: Adsorption, Light hydrocarbons, Metal-organic framework, Natural gas, Selectivity, Separation

摘要： Metal-organic frameworks (MOFs) have great potentials as adsorbents for natural gas purification. However, the trade-off between selectivity and adsorption capacity remains a challenge. Herein, we report a pillared-layer metal-organic framework Ni(HBTC)(bipy) for efficiently separating the C₃H₈/C₂H₆/CH₄ mixture. The experimental results show that the adsorption capacity of C₃H₈ and C₂H₆ on Ni(HBTC)(bipy) are as high as 6.18 and 5.85 mmol·g^-1, while only 0.93 mmol·g^-1 for CH₄ at 298 K and 100 kPa. Especially, the adsorption capacity of C₃H₈ at 5 kPa can reach an unprecedented 4.52 mmol·g^-1 and for C₂H₆ it is 1.48 mmol·g^-1 at 10 kPa. The ideal adsorbed solution theory predicted C₃H₈/CH₄ selectivity is as high as 1857.0, superior to most of the reported materials. Breakthrough experiment results indicated that material could completely separate the C₃H₈/C₂H₆/CH₄ mixture. Therefore, Ni(HBTC)(bipy) is a promising material for separation of natural gas.

关键词: Adsorption, Light hydrocarbons, Metal-organic framework, Natural gas, Selectivity, Separation

Pengtao Guo, Miao Chang, Tongan Yan, Yuxiao Li, Dahuan Liu. A pillared-layer metal-organic framework for efficient separation of C₃H₈/C₂H₆/CH₄ in natural gas[J]. Chinese Journal of Chemical Engineering, 2022, 42(2): 10-16.

Pengtao Guo, Miao Chang, Tongan Yan, Yuxiao Li, Dahuan Liu. A pillared-layer metal-organic framework for efficient separation of C₃H₈/C₂H₆/CH₄ in natural gas[J]. 中国化学工程学报, 2022, 42(2): 10-16.

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A pillared-layer metal-organic framework for efficient separation of C₃H₈/C₂H₆/CH₄ in natural gas

A pillared-layer metal-organic framework for efficient separation of C₃H₈/C₂H₆/CH₄ in natural gas

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