Maximizing acetylene packing density for highly efficient C2H2/CO2 separation through immobilization of amine sites within a prototype MOF

•A new strategy to maximize the acetylene packing density has been developed.•The CAU-10-NH2 exhibits very high C2H2/CO2 selectivity with low Qst.•Recognition mechanism has been revealed by neutron powder diffraction. For practical separation applications, porous sorbents with high separation perfor...

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Bibliographic Details
Published in:	Chemical engineering journal (Lausanne, Switzerland : 1996) Switzerland : 1996), 2022-03, Vol.431, p.134184, Article 134184
Main Authors:	Zhang, Xin, Lin, Rui-Biao, Wu, Hui, Huang, Yuhang, Ye, Yingxiang, Duan, Jingui, Zhou, Wei, Li, Jian-Rong, Chen, Banglin
Format:	Article
Language:	eng
Subjects:	Acetylene cluster Acetylene separation Free amine High packing density Metal–organic frameworks
Online Access:	Get full text
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Summary:	•A new strategy to maximize the acetylene packing density has been developed.•The CAU-10-NH2 exhibits very high C2H2/CO2 selectivity with low Qst.•Recognition mechanism has been revealed by neutron powder diffraction. For practical separation applications, porous sorbents with high separation performance, low heat of adsorption, high stability and low production cost are highly desired. A plausible strategy is herein developed through immobilization of amine sites in a prototype MOF for maximized packing density and selectivity. The CAU-10-NH2 material exhibits high packing density of 0.46 cm3/g, C2H2 adsorption capacity (4.1 mmol/cm3, at 0.5 bar), and high C2H2/CO2 selectivity of 10.8, which outperformed the unfunctionalized benchmark material CAU-10-H. Neutron powder diffraction study reveals the formation of densely packed C2H2 as tetrameric clusters in the pore. The separation performance of CAU-10-NH2 well remains in column separation conditions, with a remarkable dynamic selectivity of 10.9. The good water-stability and one-step synthesis from commercially available precursors make this material a promising candidate for practical C2H2/CO2 separation.
ISSN:	1385-8947 1873-3212