3 years ago

Pillar-Layered Metal–Organic Framework with Sieving Effect and Pore Space Partition for Effective Separation of Mixed Gas C2H2/C2H4

Pillar-Layered Metal–Organic Framework with Sieving Effect and Pore Space Partition for Effective Separation of Mixed Gas C2H2/C2H4
Bing-bing Wu, Hai-Xing Feng, Yue-Peng Cai, Ren-Feng Dong, Ying Yu, Xu-Jia Hong, Qin Wei
The removal of acetylene from the industrial feed gas to purify the ethylene is an important and challenging issue. The adsorption-based separation is a more environmentally friendly and cost-effective method compared to the current removal approaches such as partial hydrogenation and solvent extraction, while facing the challenge of developing materials with high C2H2/C2H4 selectivity and C2H2 capacity. Herein, by expanding mixed-metal organic frameworks (M’MOFs) structure with high C2H2/C2H4 selectivity, we report a pillar-layered MOF, {[Cd5(MPCZ)2(BDC)3(NO3)2(H2O)4]·G}n (MECS-5), which not only inherits the sieving effects of M’MOF series but also develops its own characteristic—the 2D layer with expanding space and the plane pore-partition group to “cover” it. MECS-5 shows higher ideal adsorption solution theory C2H2/C2H4 selectivity than the most reported MOFs, especially more than 5 times higher than MOF-74 series while displaying great enhancement in the C2H2 capacity, more than 2 times higher compared to the M’MOF. The column breakthrough experiment further proves the possibility of MECS-5a for real industrial ethylene purification.

Publisher URL: http://dx.doi.org/10.1021/acsami.7b10420

DOI: 10.1021/acsami.7b10420

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