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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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Frontiers of Chemical Science and Engineering 2020年第3期14卷 425-435页

作者： Mahboube Ghahramaninezhad Fatemeh Mohajer Mahdi Niknam Shahrak Department of Chemical Engineering Quchan University of TechnologyQuchan 94771-67335Iran

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 *** this work,a novel microporous adsorbent for carbon capturing was developed via functionalization of zeolitic imidazolate framework-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 ***,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 *** 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 *** 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 ***,the selectivity of CO2/N2 was investigated at different temperatures,revealing the ZIF-91-OLi as a selective adsorbent for industrial application.

关键词： hard/hard structure acidic hydrogen ZIF-91 carbon capture ZIF-91-OLi

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