A Robust Two-dimensional Layered Metal-Organic Framework for Efficient Separation of Methane from Nitrogen
aKey Laboratory of Biomass Chemical Engineering of the Ministry of Education, College of Chemical and Biological Engineering, Zhejiang University, 38 Zheda Road, Hangzhou 310027, P. R. China.
bInstitute of Zhejiang University-Quzhou, Quzhou, 78 Jiuhua Boulevad North, Quzhou 32400, P. R. China.
Selective capture and separation of methane (CH4) from nitrogen (N2) is a feasible approach to mitigate the effects of global warming and to improve the heating value of low-quality natural gas. However, the efficient separation of CH4/N2 is a challenge issue since their very close kinetic diameters and thermodynamic properties. In this work, we successfully combine twisted organic ligand (4-DPDS = 4,4’-dipyridyldisulfide) and angular inorganic anion (CrO42-) forming a new class of robust two-dimensional (2D) layered rhomboid grids with ionic polar environment. This a new type of 2D layered metal-organic framework (MOF) with permanent rhomboid pore channels, denoted as Ni(4-DPDS)2CrO4, was synthesized for the first time and used for CH4/N2 separation. Such a 2D layered material is rarely used for methane and nitrogen separation and shows high affinity towards CH4 thereby affording admirable methane adsorption and separation performance. Specifically, it not only performs high stability as outstanding as or even better than previously reported 3D MOFs but also exhibits a relatively high CH4 adsorption capacity of 0.95 mmol/g. Ni(4-DPDS)2CrO4 has a high affinity towards CH4 with the highest reported Qst value of 28.4 kJ/mol as well as a high CH4/N2 selectivity of 7.3, which is comparable to the state-of-the-art MOF materials reported so far.
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