Abstract
Post-synthetic functionalization or modification has been regarded as a promising strategy to treat surfaces of adsorbents for their applications in targeted adsorption and separation processes. In this work, a novel microporous adsorbent for carbon capturing was developed via functionalization of zeolitic imidazolate frame-work-91 (ZIF-91) to generate a hard/hard (metal-oxygen) structure named as lithium-modified ZIF-91 (ZIF-91-OLi compound). To this purpose, the ZIF-91 compound as an intermediate product was achieved by reduction of ZIF-90 in the presence of NaBH4 as a good reducing agent. Afterwards, acidic hydrogen atoms in the hydroxyl groups of ZIF-91 were exchanged with lithium cations via reaction of n-BuLi compound as an organo lithium agent through an appropriate procedure. In particular, the as-synthesized ZIF-91-OLi operated as an excellent electron-rich center for CO2 adsorption through trapping the positive carbon centers in the CO2 molecule. DFT calculations revealed that the presence of lithium over the surface of ZIF-91-OLi adsorbent plays an effective role in double enhancement of CO2 storage via creating a strong negative charge center at the oxygen atoms of the imidazolate linker as a result of the lithium/hydrogen exchange system. Finally, the selectivity of CO2/N2 was investigated at different temperatures, revealing the ZIF-91-OLi as a selective adsorbent for industrial application.
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Improved CO2 Capture Performances of ZIF-90 through Sequential Reduction and Lithiation Reactions to Form a Hard/Hard Structure
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Ghahramaninezhad, M., Mohajer, F. & Niknam Shahrak, M. Improved CO2 capture performances of ZIF-90 through sequential reduction and lithiation reactions to form a hard/hard structure. Front. Chem. Sci. Eng. 14, 425–435 (2020). https://doi.org/10.1007/s11705-019-1873-5
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DOI: https://doi.org/10.1007/s11705-019-1873-5