Journal
CHEMICAL ENGINEERING JOURNAL
Volume 477, Issue -, Pages -Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.cej.2023.147001
Keywords
Ultra-microporous metal-organic frameworks; Multiple hexafluorosilicate functionalities; High concentration of hexafluorosilicate anions
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An ultra-microporous interpenetrated MOF, SIFSIX-DPA-Cu-i, featuring multiple functional hexafluorosilicate anions, has been constructed for efficient C2H2 separation from C2H2/CO2 and C2H2/C2H4 gases mixture, showing promising potential for practical applications.
Tremendous effort has been endeavored to improve the C2H2 separation performance of porous solid materials from CO2 and C2H4, aiming to gain high purity of C2H2 for producing various downstream commodities. Herein, an ultra-microporous interpenetrated MOF, SIFSIX-DPA-Cu-i, featuring multiple functional hexafluorosilicate anions, has been constructed for efficient C2H2 separation from C2H2/CO2 and C2H2/C2H4 gases mixture. Significantly, SIFSIX-DPA-Cu-i presents good C2H2/CO2 and C2H2/C2H4 separation performance, especially for C2H2/CO2, with the value of 9.34 at 298 K and 1 bar due to the introduction of a high concentration of hexa-fluorosilicate anions capable of preferentially capturing C2H2 through forming a strong C2H2 nano-trap arising from the strong C-H center dot center dot center dot F and C equivalent to C center dot center dot center dot H interactions confirmed by in situ IR and molecular modeling. Moreover, the consecutive transient-breakthrough experiments further demonstrate the outstanding potential of SIFSIX-DPA-Cu-i for practical C2H2/CO2 and C2H2/C2H4 separation applications.
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