Highly C2/C1-Selective Covalent Organic Frameworks Substituted with Azo Groups

Huang, Shaofeng; Hu, Yiming; Tan, Li-Li; Wan, Shun; Yazdi, Sadegh; Jin, Yinghua; Zhang, Wei

doi:10.1021/acsami.0c15328

Title: Highly C2/C1-Selective Covalent Organic Frameworks Substituted with Azo Groups

Journal Article · Fri Nov 06 00:00:00 EST 2020 · ACS Applied Materials and Interfaces

DOI:https://doi.org/10.1021/acsami.0c15328· OSTI ID:1907246

^[1]; Hu, Yiming ^[1]; Tan, Li-Li ^[2];

^[3];

^[1]; Jin, Yinghua ^[3];

^[1]

Univ. of Colorado, Boulder, CO (United States)
Northwestern Polytechnical Univ. and Shaanxi Joint Laboratory of Graphene (NPU), Xi’an (China)
NCO Technologies LLC, Longmont, CO (United States)

A series of covalent organic frameworks substituted with azo groups (AzoCOFs) have been synthesized via imine condensation. The obtained frameworks show crystallinity and high stability. More importantly, the AzoCOFs exhibit exceptionally high ideal adsorption solution theory (IAST) selectivity in adsorption of C₂H₂ (35–2891) over CH₄ at 273 K and 1 bar, owing to the favorable interactions between azo groups and acetylene molecules. The dependence of the gas adsorption property on pore size and polarity of the frameworks was also studied. Here, the triethylene glycol substituted Tg-AzoCOF shows the highest C₂H₂/CH₄ selectivity (IAST selectivity of 2891), which represents the highest reported for all porous materials. The AzoCOFs also exhibit high IAST adsorption selectivity of C₂H₄/CH₄ (11–20), C₂H₆/CH₄ (15–22), and CO₂/CH₄ (12–37), which is comparable with most porous materials, thus showing their great potential in gas separation applications.

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Research Organization:: NCO Technologies LLC, Longmont, CO (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Engineering & Technology. Office of Small Business Innovation Research (SBIR) and Small Business Technology Transfer (STTR) Programs

Grant/Contract Number:: SC0017246; SC0019843

OSTI ID:: 1907246

Journal Information:: ACS Applied Materials and Interfaces, Vol. 12, Issue 46; ISSN 1944-8244

Publisher:: American Chemical Society (ACS)Copyright Statement

Country of Publication:: United States

Language:: English

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37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
covalent organic framework
azo group
imine condensation
selective gas adsorption
C2/C1 separation
adsorption
hydrocarbons
molecules
selectivity

Title: Highly C2/C1-Selective Covalent Organic Frameworks Substituted with Azo Groups

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