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

• Published in: ACS applied materials & interfaces Vol. 14; no. 3; pp. 4242 - 4250
• Main Authors: Tu, Shi, Yu, Liang, Lin, Danxia, Chen, Yongwei, Wu, Ying, Zhou, Xin, Li, Zhong, Xia, Qibin
• Format: Journal Article
• Language: English
• Published: United States American Chemical Society 26.01.2022
• Subjects: Energy, Environmental, and Catalysis Applications; natural gas; coal-mine methane; adsorption separation; metal−organic frameworks; methane purification
• ISSN: 1944-8244; 1944-8252
• DOI: 10.1021/acsami.1c23249

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/N2 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/N2 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/N2 separations.