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Pyrazine-interior-embodied MOF-74 for selective CO2 adsorption
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  • meng zhao,
  • Yujie Ban,
  • Ze Chang,
  • Yingwu Zhou,
  • Kun Yang,
  • Yuecheng Wang,
  • Na Cao,
  • Weishen Yang
meng zhao
Dalian Institute of Chemical Physics
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Yujie Ban
Dalian Institute of Chemical Physics
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Ze Chang
Nankai University
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Yingwu Zhou
Dalian Institute of Chemical Physics
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Kun Yang
Dalian Institute of Chemical Physics
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Yuecheng Wang
Dalian Institute of Chemical Physics
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Na Cao
Dalian Institute of Chemical Physics
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Weishen Yang
Dalian Institute of Chemical Physics
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Abstract

A series of pyrazine-interior-embodied MOF-74 composites (py-MOF-74) were successfully synthesized by a post vapor modification method, concomitant with the loading ratio of pyrazine easily controlled in this process. Here, pyrazine molecules perform as a cavity-occupant to block the wide pores of MOF-74, which accentuates the adsorption discrepancy of a pair of gases on MOFs and consequently reinforces the adsorption selectivity (typically for CO2/N2, CO2/CH4). Different from the “physical confinement” of occupants, pyrazine molecule with dual “para-nitrogen” atoms donates one N atom to bond with the open metal ion of MOF-74 for stability, and remains the other N atom available for potential CO2 trapping site. Pyrazine-interior-embodied MOF-74 composites manifest significantly improved CO2/N2 and CO2/CH4 adsorption selectivity. Typically, py-MOF-74c with ultimate pyrazine insertion displays selectivity greatly superior to MOF-74 in the equimolar CO2/CH4 (598 vs. 35) and the simulated CO2/N2 flue gas (471 vs. 49) at 100 kPa and 298 K.

Peer review status:UNDER REVIEW

15 Apr 2021Submitted to AIChE Journal
19 Apr 2021Assigned to Editor
19 Apr 2021Submission Checks Completed
03 May 2021Reviewer(s) Assigned