Robust metal–organic framework with abundant large electronegative sites for removal of CO2 from a ternary C2H2/C2H4/CO2 mixture. Issue 19 (22nd August 2022)

• Record Type: Journal Article
• Authors: Xiong, Cheng; Xiao, Yan-Hong; Liu, Qingyou; Chen, Ling; He, Chun-Ting; Liu, Qing-Yan; Wang, Yu-Ling
• Is Part Of: Inorganic chemistry frontiers. Volume 9:Issue 19(2022)
• Page Start: 5064
• Page End: 5071
• Publication Date: 2022-08-22
• Subjects: Chemistry, Inorganic -- Periodicals; 546.05
• DOI: 10.1039/d2qi01175a
• Languages: English
• ISSNs: 2052-1553

Abstract

Abstract : Herein, a MOF with cavities decorated with high-density electronegative F and O sites for the challenging separation of a ternary equimolar mixture of C2 H2, C2 H4, and CO2 is presented. Abstract : Separation of ternary gas mixtures is challenging and has rarely been achieved with a single porous solid material. Herein a trinuclear iron(iii ) based metal–organic framework (MOF) with high water stability, {[Fe3 (μ3 -O)(DFBDC)3 (TPT)](OH)} n (JXNU-14) (DFBDC 2− = 2, 5-difluoroterephthalate and TPT = 2, 4, 6-tri(4-pyridinyl)-1, 3, 5-triazine), is applied for the removal of CO2 from a ternary C2 H2 /C2 H4 /CO2 mixture. The trigonal bipyramidal cavities and cylindrical cavities decorated with highly electronegative fluorine and oxygen atoms and abundant π rings in JXNU-14 offer stronger affinity for C2 H2 and C2 H4 than for CO2, resulting in the high-performance separation of a ternary equimolar mixture of C2 H2, C2 H4, and CO2, which is demonstrated by pure-component gas adsorption isotherms and actual column breakthrough experiments. The much stronger binding of C2 H2 and C2 H4 as compared to CO2 was further revealed by computational simulations. This work provides a useful strategy for the construction of MOFs possessing high-density electronegative sites for the efficient removal of CO2 from a ternary C2 H2 /C2 H4 /CO2 mixture.