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Versatile CO2 Transformations into Complex Products: A One-pot Two-step Strategy
Published on: November 9, 2019
Interpenetration-Constructed Amide-Functionalized MOF for Selective C2H2/CO2 Separation
Zhenyu Han1, Chunyu Lu1, Xiaoqing Lu1
1Shandong Key Laboratory of Intelligent Energy Materials, School of Materials Science and Engineering, China State Key Laboratory of Heavy Oil Processing, China University of Petroleum (East China), Qingdao, Shandong266580, P. R. China.
Abstract:
Acetylene (C2H2) purification plays a vital role in various chemical syntheses and industrial processes, yet the fabrication of ideal MOF adsorbents for C2H2 still remains challenging. Herein, a doubly interpenetrated metal-organic framework (Zn-btcb-dmtrz) was solvothermally synthesized from 4,4',4″-((benzene-1,3,5-tricarbonyl)tris(azanediyl))tribenzoic acid (H3btcb), 3,5-dimethyl-1,2,4-triazole (dmtrz), and Zn(NO3)2·6H2O. The interpenetrated framework integrates a high Brunauer-Emmett-Teller (BET) surface area (1015 m2/g) with densely packed amide groups, which endows the material with great capability to distinguish C2H2 from CO2. GCMC simulations confirmed the different spatial distributions of the two gas molecules: C2H2 interacts with -CONH- groups via C-H···O and C-H···N bonds, whereas CO2 forms C-H···O and N-H···O hydrogen bonds with benzene rings and -CONH- moieties. IAST calculations further showed that Zn-btcb-dmtrz delivers a C2H2 /CO2 (50/50) separation selectivity of 2.6 at 298 K and 100 kPa.
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