Abstract
C2H2/CO2 separation is a highly challenging process as a consequence of their similar physicochemical properties. In this work we have explored, by static and dynamic gas sorption techniques and computational modelling, the suitability of a series of two isoreticular robust Ni(II)pyrazolate‐based MOFs, bearing alkyne moieties on the ligand backbones, for C2H2/CO2 separation. The results are consistent with high adsorption capacity and selectivity of the essayed systems towards C2H2 molecules. Furthermore, a post‐synthetic treatment with KOH ethanolic solution gives rise to linker vacancy defects and incorporation of extraframework potassium ions. Creation of defects is responsible for increased adsorption capacity for both gases, however, strong interactions of the cluster basic sites and extraframework potassium cations with CO2 molecules are responsible for a lowering of C2H2 over CO2 selectivity.
Highlights
Gas separation is one of the major challenging industrial processes due to high energy consumption of traditional thermal separation procedures.[1]
[Ni8(OH)4(H2O)2(L)6] Metal-organic frameworks (MOFs) (abbreviated as [Ni8(L)6], where L is a general bis-pyrazolate linker, are based on octanuclear Ni8(OH)4(H2O)2(pyrazolate)12 SBUs acting as 12 connected nodes, leading to 3D fcu networks with highly accessible Td and Oh voids.[17]
As previously reported by some of us, postsynthetic modification treatment of [Ni8(OH)4(H2O)2(1,4-bipyrazolatebenzene)6] with KOH ethanolic solution leads to the creation of linker vacancy defects within the MOF structures with a concomitant higher pore accessibility and adsorption interactions.[19]
Summary
Gas separation is one of the major challenging industrial processes due to high energy consumption of traditional thermal separation procedures.[1] Despite of the considerable progress in separation technologies, the development of highperformance alternatives for gas separation processes with lower energy penalty, such as adsorption, is regarded as a serious priority that can help to mitigate global warming.[2]. Metal-organic frameworks (MOFs) and related materials have emerged as a fascinating group of [a] F. A. Morsali Department of Chemistry Faculty of Sciences Tarbiat Modares University P.O. Box 14115-175, Tehran (Iran)
Sign-in/Register to view highlights & summary Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
