Pyridyl Ionic Liquid Functionalized ZIF-90 for Catalytic Conversion of CO 2 into Cyclic Carbonates
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Pyridyl Ionic Liquid Functionalized ZIF‑90 for Catalytic Conversion of CO2 into Cyclic Carbonates Hui Yuan1 · Yuanfeng Wu1 · Xiaomei Pan1 · Lijing Gao1 · Guomin Xiao1 Received: 13 February 2020 / Accepted: 9 May 2020 © Springer Science+Business Media, LLC, part of Springer Nature 2020
Abstract The aim of this work was to investigate the enchanted catalytic activity of three ionic liquids functionalized ZIF-90 for CO2 cycloaddition. Characterizations such as XRD, FT-IR, SEM, XPS, BET, TG and CO2/NH3-TPD were adopted to systematically study the structure and properties of functionalized catalysts. When functionalized by [1-aminoethyl-pyridinium]Br (ZIF-90-IL-1), ZIF-90 was found to possess the highest catalytic activity among the three catalysts, which was consistent with the results of CO2/NH3-TPD characterizations. The reaction was carried out under the conditions of a catalyst addition amount of 1.0 wt%, an initial pressure of 25 bar and a temperature of 90 °C and 96.27% of propylene oxide (PO) conversion and 94.51% of propylene carbonate (PC) yield were obtained when the reaction was lasted to 8 h. In addition, ZIF-90-IL-1 was used in the coupling reaction of various epoxides with CO2 under the same reaction conditions, and it was found that when allyl-glycidyl ether (AGE) was used as a substrate, the yield was the highest. Graphic Abstract One-pot catalytic conversion of CO2 into cyclic carbonate over pyridyl ionic liquid functionalized ZIF-90.
Keywords Functionalized ZIF-90 · Ionic liquids · CO2 · Cycloaddition · Epoxides
1 Introduction Following the synthesis of MOFs, a more complex zeolitic imidazole ester framework material (ZIFs) has been discovered, which is composed of a plurality of imidazole ring-type organic molecules bridged by metal atoms [1, 2]. At present, Electronic supplementary material The online version of this article (https://doi.org/10.1007/s10562-020-03259-z) contains supplementary material, which is available to authorized users. * Guomin Xiao [email protected] 1
School of Chemistry and Chemical Engineering, Southeast University, Nanjing 211189, China
several products have been found to possess many excellent properties, such as large specific surface area, high thermal stability, easy recovery, various structures, and adjustable properties [3, 4]. It can be applied for gas storage [5], filtration [6] and catalysis [7]. There are attractive application prospects in many fields, which have aroused widespread interest among researchers [8]. For example, some ZIFs can form the unsaturated nodes within the crystal structure when solvent molecules were removed under mild vacuum heating conditions [9]. More importantly, the unsaturated nodes have the function of enhancing acid-promoting reactions. On the other hand, since the industrial revolution, a large number of non-renewable resources such as coal, oil, natural gas and other fossil fuels have been extensively developed
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and consumed, as a result the burning of fossil fuels has made a negative
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