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Linker Vacancy Engineering of a Robust ftw–type Zr–MOF for Hexane Isomers Separation

Journal Article · · Angewandte Chemie (International Edition)
 [1];  [2];  [3];  [3];  [4];  [4];  [5];  [3];  [6]
  1. Shenzhen Polytechnic, Guangdong (China); Rutgers University
  2. Chinese Academy of Sciences, Dalian (China)
  3. King Abdullah University of Science and Technology, Thuwal (Saudi Arabia)
  4. Shenzhen Polytechnic, Guangdong (China)
  5. Chinese Academy of Sciences, Dalian (China); University of Chinese Academy of Sciences, Beijing (China)
  6. Shenzhen Polytechnic, Guangdong (China); Rutgers University, Piscataway NJ (United States)
Discrimination of physically similar molecules by porous solids represents an important yet challenging task in industrially relevant chemical separations. Precisely controlled pore dimension and/or tailored pore surface functionality are crucial to achieve high-efficiency separation. Metal-organic frameworks (MOFs) are promising candidates for these challenging separations in light of their structural diversity as well as highly adjustable pore dimension/functionality. We report here a microporous, ftw-type Zr-based MOF structure, HIAM-410 (HIAM=Hoffmann Institute of Advanced Materials), built on hexanuclear Zr6 cluster and pyrene-1,3,6,8-tetracarboxylate (ptc4–). Its crystallographic structure has been determined using continuous rotation electron diffraction (cRED) technique combined with Rietveld refinement against powder X-ray diffraction data, aided by low-dose high-resolution transmission electron microscopy (HRTEM) imaging. The compound features exceptional framework stability that is comparable to the prototype MOF UiO-66. Interestingly, the linker vacancies in the pristine MOF structure could be partially restored by post-synthetic linker insertion. Its separation capability of hexane isomers is enhanced substantially upon the linker vacancy engineering. As a result, the restored structure exhibits efficient splitting of monobranched and dibranched hexane isomers at both room temperature and industrially relevant temperature.
Research Organization:
Wake Forest University, Winston-Salem, NC (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
Grant/Contract Number:
SC0019902
OSTI ID:
2305734
Journal Information:
Angewandte Chemie (International Edition), Journal Name: Angewandte Chemie (International Edition) Journal Issue: 24 Vol. 62; ISSN 1433-7851
Publisher:
WileyCopyright Statement
Country of Publication:
United States
Language:
English

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