Song Zhirong, Zheng Yanchun, Chen Yiqi, Cai Youlie, Wei Rong-Jia, Gao Junkuo
Institute of Functional Porous Materials, The Key laboratory of Advanced Textile Materials and Manufacturing Technology of Ministry of Education, College of Materials and Textiles, Zhejiang Sci-Tech University, Hangzhou 310018, China.
College of Chemistry and Materials Science, Jinan University, Guangzhou 510632, China.
Dalton Trans. 2023 Oct 31;52(42):15462-15466. doi: 10.1039/d3dt01554h.
As a rich green energy source, natural gas is widely used in many fields such as the chemical industry, automobile energy, and daily life. However, it is very challenging to separate and recover CH and CH from natural gas. Metal-organic frameworks (MOFs) as an emerging type of multi-pore porous materials show huge potential in gas adsorption separation. Herein, we report pillar-layered MOFs, Ni (BDC)(DABCO) (DMOF-X), modified by halogen atoms (F, Cl, Br), and investigate their CH/CH/CH separation performance. The experimental results show that DMOF-Cl exhibited a extremely high adsorption capacity for CH and CH. Under the conditions of 298 K and 100 kPa, the adsorption capacities for CH and CH on DMOF-Cl are as high as 6.23 and 4.94 mmol g, which are superior to the values for most of the porous materials that have been reported. In addition, DMOF-Cl also shows high CH/CH (5: 85, V/V) and CH/CH (10: 85, V/V) separation selectivities, with values of 130.9 and 12.5, respectively. Finally, DMOF-Cl also demonstrated great potential as an adsorbent for separating CH/CH/CH.
作为一种丰富的绿色能源，天然气广泛应用于化工、汽车能源和日常生活等诸多领域。然而，从天然气中分离和回收CH₄和C₂H₄极具挑战性。金属有机框架材料（MOFs）作为一种新型的多孔材料，在气体吸附分离方面展现出巨大潜力。在此，我们报道了经卤素原子（F、Cl、Br）修饰的柱状层状MOFs，即Ni(BDC)(DABCO)（DMOF-X），并研究了它们对CH₄/C₂H₄/C₂H₆的分离性能。实验结果表明，DMOF-Cl对CH₄和C₂H₄表现出极高的吸附容量。在298K和100kPa条件下，DMOF-Cl对CH₄和C₂H₄的吸附容量分别高达6.23和4.94mmol/g，优于大多数已报道的多孔材料。此外，DMOF-Cl对CH₄/C₂H₄（5:85，V/V）和CH₄/C₂H₆（10:85，V/V）也表现出较高的分离选择性，其值分别为130.9和12.5。最后，DMOF-Cl作为分离CH₄/C₂H₄/C₂H₆的吸附剂也展现出巨大潜力。
