Robust Nickel-Based Metal-Organic Framework for Highly Efficient Methane Purification and Capture

作者：Tu, Shi; Yu, Liang; Lin, Danxia; Chen, Yongwei; Wu, Ying^*; Zhou, Xin; Li, Zhong; Xia, Qibin^*

来源：ACS applied materials & interfaces, 2022, 14(3): 4242-4250.

DOI：10.1021/acsami.1c23249

• metal-organic frameworks
• adsorption separation
• methane purification
• natural gas
• coal-mine methane

Developing energy-efficient alternatives for methane (CH4) purification from natural gas and methane capture of coal-mine gas is of great significance and challenge in the chemical industry. Herein, we report a robust nickel-based metal-organic framework (MOF), Ni-BPZ, featuring one-dimensional (1D) rhombic channels decorated with abundant pyrazole rings. Ni-BPZ exhibits excellent separation performance toward both C2H6/CH4 and CH4/N-2 binary mixtures. The C2H6/CH4 selectivity of Ni-BPZ is high, up to 50.2, exceeding those of most MOF adsorbents reported, and it simultaneously possesses a remarkable C2H6 uptake of 2.46 mmol/g at 298 K and 0.1 bar. The CH4/N-2 selectivity of Ni-BPZ reaches 6.6, and its high CH4 uptake is 1.56 mmol/g, which is also superior to most high-performance CH4 adsorbents. The molecular simulation reveals that the uniform 1D rhombic channels with abundant pyrazole rings provide a high density of potential adsorption sites for efficient C2H6/CH4 and CH4/N-2 separations.

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