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Ion-Exchange Fabrication of Hierarchical Al-MOF-Based Resin Catalysts for the Tandem Reaction

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journal contribution
posted on 29.07.2020, 20:29 by Yanjing Hu, Jian Zhang, Zhe Wang, Hang Huo, Yanqiu Jiang, Xianzhu Xu, Kaifeng Lin
Metal–organic framework (MOF)-supported macroscale resin catalysts, IRA900­(xOH)-MIL-101­(Al)–NH2 (x means the concentration of NaOH), with spatially isolated antagonistic acid–base active sites were successfully synthesized through a novel strategy by ion exchange and in situ solvothermal methods. The hierarchical pore system of the as-prepared catalysts effectively promotes the mass transfer and contacts with catalytic active centers during the organic reactions. Therefore, the environmentally friendly catalysts exhibit excellent superior activity and stability in one-pot deacetalization–Knoevenagel condensation reaction, and the yield by optimal IRA900­(0.2OH)-MIL-101­(Al)–NH2 reaches close to 99% after 5 h at 110 °C. Thanks to the millimeter-sized resin carrier and robust sphere morphology, the recycling of the as-prepared catalysts only requires natural sedimentation. This work presents an effective strategy to build low-toxic acid–base catalysts by combining the advantages of ion-exchange resins and functionalized MOF materials.