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A series of cation-modified robust zirconium-based metal–organic frameworks for carbon dioxide capture

Journal Article · · CrystEngComm
DOI:https://doi.org/10.1039/d2ce01633h· OSTI ID:2305681
Metal–organic frameworks (MOFs) represent one of the most promising porous solids for possible use as sorbents to control and reduce the greenhouse gas emission. Studies have shown that open metal sites (OMS) interact strongly with carbon dioxide and thus, serve as efficient binding sites for CO2 capture. However, many OMS-bearing MOFs are lack of framework stability and often have high regeneration temperature. To seek ways to solve the stability issue, we designed a series of isoreticular MOFs, Zr-tcpb-COOM (M = alkali/alkaline earth metal), by exchange of protons with metal ions on Zr-tcpb-COOH via post-synthetic modification (PSM). The pristine MOF (Zr-tcpb-COOH) has a very robust framework. The PSM process does not deteriorate the framework stability but creates metal binding sites that form strong bonds with carbon dioxide. The results show that at low CO2 pressure, the uptake amount is enhanced considerably using Zr-tcpb-COOM and is in trend of increasing atomic number (Li+ < Na+ < K+ < Ca2+). High adsorption selectivity (CO2/N2 IAST selectivity (15 : 85) = 539.5) is also achieved for CO2 over N2 at room temperature. This approach offers a feasible method to improve CO2 capture capacity, especially at low concentrations.
Research Organization:
Wake Forest University, Winston-Salem, NC (United States)
Sponsoring Organization:
USDOE; USDOE Office of Science (SC), Basic Energy Sciences (BES)
Grant/Contract Number:
SC0019902
OSTI ID:
2305681
Alternate ID(s):
OSTI ID: 1908866
Journal Information:
CrystEngComm, Journal Name: CrystEngComm Journal Issue: 7 Vol. 25; ISSN 1466-8033
Publisher:
Royal Society of ChemistryCopyright Statement
Country of Publication:
United States
Language:
English

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